How much of this is… actually in character? You seem to be moving the goalpost a lot and kinda not going over how the fight plays out. Sure, Hax are all fine and dandy but how much of them are actually used and not just you thinking of the fastest way ley beats sasuke instead of the most realistic way
All of it is, he goes for the best way to end his opponents as seen in Ram vs Ley where he did everything he could to end the fight instantly
Ley has eaten over 10,000 transcendents which includes the worlds top scientists, battle analysts, martial artists etc. And Ley is the Gourmet part of Gluttony so he only eats top tier people. None of those 10,000 are fodder.
I personally think he would open with dura neg + teleportation. This, I believe, is very likely to work because his base perception speed boost + normal stat amp is almost enough to cover the gap and teleportation would be enough to finish the final gap to surprise Sasuke and catch him off guard. A good palm of the fist king is enough to end it here
However if Sasuke manages to dodge this then these are the following things Ley might do next:
1. first under any circumstances, he would notice the speed gap, he can bypass this with yin magic debuff or try to hide from Sasuke by using shamak (before fezzih pops in, Shamak is a basic spell that even Subaru with 0 training could use multiple times. Ley is a combat genius and obviously knows this technique along with a proper control on it, he would absolutely think of using this or maybe even the higher tier varients like El Shamak,or Ul Shamak)
2. If he does above then he can just end the fight with some well placed hits + some wind magic spells that Sasuke can't sense and get sliced apart
3. He could teleport away and if Sasuke recovers fast enough and Ley doesn't move then he gets Amaterasu'd gg
4. He teleports around and does what he did against Ram, setting up wind traps and attacks which will make moving impossible and cause Sasuke to take major damage