It seems like we are going in circles, but let me say this, the Ryuk factor isn't absolute and cannot be used by Light every time he wants. Light just confirmed his suspicion with Ryuk, and there are many times when Ryuk hasn't helped Light.
That was only because Lindy boy Really pissed off light by calling him out. Plus, the world already knew that Kira existed. If Ayanokoji took a secretive approach, he couldn’t really figure out or at least present solid evidence that Kira needed a name and face to kill. That was the whole point of L revealing himself as the real L in the second half of the broadcast. Lind’s death wouldn’t really prove anything, he’d just become another Kira victim regardless of whether or not Kira has to kill with a name and face or not unless Ayanokoji does the same thing as L, which is pretty out of character for him.
Kiyotaka will use baits by using others.
The entire reason why L even revealed himself was to counter Light isolating him from help. But here, that is not the case, as Kiyotaka is having his own team instead of some police, and he wouldn't really need to take the risk of finding Kira by having himself walk around.
Also, the original Lind L. Tailor scam 50% confirms that Kira needs a face to kill people.
Here's what I think Kiyotaka would do when he modifies the Lind L. Tailor scam:
1. Put a false name on the original Lind L. Tailor to deceive Light, however, never have Lind reveal his true name.
2. Then mention it blatantly that after a much longer time that there was a huge problem in him revealing his name, If the timeframe between both the things is very long (and Light will be of course seeing it due to him being Kira and needing to watch the criminals daily to kill them), then he will kill him on that spot, and then it would be revealed 100% that Kira needs both face and name of the person to kill someone.
The reason why Kiyotaka would think of it in the first place is due to his probability thinking and because of how far his risk assessment and countermeasures development goes.
He can also do the same with manipulating the information of the criminals (in fact, doing it would be much better, due to the fact that the criminals who are broadcasted would be killed one by one and if Kiyotaka forces manipulation of the name of at least one criminal, then others being killed and one being left would only make it easier for him to point out that fact and reach to the conclusion that Kira needs a name to kill).
I am very proud of myself, I legit thought of a strategy to find out both Kira's location and that he needs a name to do things.
If you look to the left at around 14-15 seconds in
This Clip, L did place a load of camera’s on light’ desk where he sat, and he still didn’ see the mini tv in the potato bag or really get anything that indicated light was Kira. Even if Ayanokoji knows about the death note and questions light, Light can just say he was studying and prove himself innocent, or even bring up how there’s many other students in kanto that could be Kira with the amount of evidence Ayanokoji would have, which would be slim-to-none at that moment
I already said that Kiyotaka would try to focus the cameras on Light's clothes and around his neck which would give us the view of Light's perspective on its own. And just like I said how Kiyotaka is a counter-measure master, even if Light was to take a muffler to cover his neck with (because it completely makes sense for Light to do it due to there being cold weather), he would put a camera by modifying the muffler as well. That's how stupidly smart Kiyotaka is in terms of keeping some countermeasures. We cannot forget as well that Kiyotaka quite literally has an unlimited budget, so buying many cameras wouldn't be that big of a problem.
Well, we do know that INTERPOL is going to have the top detectives and agents in the entire world, so I’d say their ability to stay stealthy is also really good if we compare them to real life people, and light still noticed them.
True, but the thing is that Kiyotaka would be using Tsukishiro, who has an experience of killing people, and is walking freely in the real world. Tsukishiro is a kind of person who can go as far as torturing Light, once it is found that Kira needs a name to kill people.
Plus, even if he did get face-to-face with light, unless Ayanokoji sends a bunch of FBI agents to do the work for him, that would just be an opportunity for light to know the face of X if light manages to see him stalking him,

From there, all light really needs to do is act normal just like he did with Rey Penber, (Which he does pretty much all the time anyway) and even if Ayanokoji see’s through it, he still doesn’t have any evidence to convict him.
Kiyotaka can go as far as manipulating Light's TV (you did have the recorder technology during that time) and see what Light is seeing during that time and what he is doing. I am telling you; Kiyotaka has a much more access to things than Light. And Light cannot be ready for everything. Kiyotaka can easily make his entire room with full of traps which can help him trace his positions. L's intuition was also somehow bad for him because he concluded at one thing only, but Kiyotaka is the kind of person who doesn't need more than 90% suspicion, he would try to go a full 100%.
Yeah, but light still weasels his way out of Penber’s suspicion’s by creating a busjacking incident, and makes everything else that goes down a complete accident. After that, Penber thought light was completely innocent. He even convinced penber to give him his FBI nametag to give himself an advantage later on in the series. It won’t be as easy with Ayanokoji obviously, but it doesn’t matter if Koji knows about the death note or not. If light doesn’t give Ayanokoji solid evidence that he’s Kira, Ayanokoji can’t convict him. L knew that light was Kira for a long time, and light still manages to outsmart him even though he’s more experienced in situations like this, so we know that light is more than capable of this too.
Like I said, Penber was careless, and even L could have probably instructed Penber to do better, but Penber acted on his own.
About the Kiyotaka convicting Light, and Light being able to outsmart L, it happened because L was in a very disadvantageous situation, but the thing which is true is that Near was also able to catch Light, due to the counter measures exploitation, which Light almost needs a high amount of prep time to deal with (he needed almost a week to think for all the countermeasures when he was planning to lose his memories), and Kiyotaka can attack Light as much as he wants. Honestly, this doesn't seem like Light has even a bit of an advantage here. Kiyotaka can quite literally cut Light's house's power, and Light would never be ready with another mini-TV just because he wouldn't just randomly know that someone was actually going to do that thing with him.
Yeah, but light can always bribe ryuk to do things he doesn’t want to himself with apples, like he did with the camera’s.
True, but we know that Light doesn't use it very often, neither does Ryuk seem naturally very hungry for apples. He like apples, but again, he isn't going to do something which can directly put Kiyotaka at a risk (because he himself wanted a fair fight between Light and L), but only help Light to escape situations, and that too, he doesn't do every time regularly. Also, Ryuk isn't always like "If you give me apples, then I will help you.", we cannot really use one time of Ryuk helping Light as an excuse of him always being a help and ignore that there are many times when Ryuk hasn't helped Light.
What would happen if light just… acted normal for an entire day and just threw the clothes in a washing machine or something to short-circuit the camera’s in his clothes? Or what if he just changed into ones that didn’t have camera’s?

I feel like that’s something light still could work around. He could probably think of something way better than those two examples I just gave.
Like I said, this is like some very stupid counter. Kiyotaka would be able to think about even the muffler thing, washing clothes is a very small part of the problems. And Kiyotaka can ultimately be much more suspicious of Light if he does anything like that.
Light didn't take a bath around that time, and that can make him suspicious. And nothing is stopping Kiyotaka from doing it literally every day, and then just changing it. He can easily see that and then put the cameras in his all the clothes.
And no, Light cannot think as much as you say. While you may think that Light is actually much smarter than you, the fact that he's desperate enough to be stupid enough to give himself to Near in times of desperation shows enough of how badly he can fail against Kiyotaka. Takuya Yagami was desperate to defeat Kiyotaka, and Light is desperate to win and show his victory egoistically.
What I thought about is just the least of the things, Kiyotaka can go as far as replicating things in Light's room and then putting them. Like he can have another desk and easily replicate it and put it in Light's room. That would hardly cost anything against even 64 cameras, considering one camera costs like $30 each (even that is probably very less, but let's go with that), then 64 would cost $1920 which is more than enough to have an entire desk replicated, which is like the storage of the Death Note.
The whole reason L met up with him at To-oh was to both test light and also to question him “secretively”. That was why he did the whole “Deductive Reasoning Skills” Test. He was suspicion of light.
L has been symbolized for "God's Intuition", and he was 90% sure that Light was Kira (even when he says that the chances of Light being Kira increase by only some percentages), this is confirmed in the Death Note guide, and even the crime files. The reason why L approached Light was to test if Light actually was smart, and the entire reason why L did the deduction test was to see if Light was actually really doing anything to have Kira protected, but yes, Light kind of thought about it and acted out to counter that as well.