Under the weakness section of Funny's profile:
"Weaknesses: Valentine must be between two objects to use D4C's ability to travel between worlds, and any damage D4C takes will be reflected onto his own body.
Funny Valentine can not move 1890's American currency between dimensions, although this is later contradicted | Valentine must maintain a certain distance from Lucy to use Love Train and must move alongside Lucy if she changes location.
To attack others and change the location of their injuries, D4C must leave the safety of the dimensional wall, becoming briefly vulnerable"
I agree that calamity will qualify under misfortune, therefore meaning it cannot bypass LT's walls and hurt Funny. But, in order to actually do anything to Tooru and attack him, Funny (or at least D4C) has to leave LT. Which would mean they now become vulnerable to the calamity. And considering the whole karmic retribution shit that goes on with the calamity, every calamity will one shot Funny/D4C. Keep in mind that
even thinking about attacking him will activate the ability, so there's no way Funny/D4C will get to Tooru without getting ******.
Also, I'm not so sure Love Train (not D4C's dimensional travel) has a greater range than WoU, considering the latter is stated to be a 'law of the world' and the Calamity itself is described as the '
World's Logic'. A link in Tooru's range section also shows how
calamities will approach from all over the earth.
Wonder of U itself is also one tough bastard to permanently put down as well, as WoU is once again stated be a
law of the world, and that the laws of calamity are things in this world that can never go away, will continue to exist after
Tooru's death (who was dusted, WoU seemingly regened from that dusting) and can survive and function with lethal wounds (this is taken from WoU's immortality section if you wanna check).
For what it's worth, I'm pretty sure Araki called calamity 'the strongest ability' in reference to villains, so that doesn't hurt either.
So yeah, I'm actually voting for incon here. As long as Funny and D4C stay in Love Train, Tooru can't do shit. But in order to attack Tooru, Funny/D4C has to leave Love Train, which will then make them subject to the calamity.