Probably not. Though I don't have a ton of faith in the administration around here enforcing those rules if they actually hired him in the first place. I'd still hold off til you had your Keyblade again though, or at least a similar weapon to use; fighting barehanded or with magic is a lot different than fighting with a weapon, and that guy looks like he could pack a punch hand-to-hand.

[This is true. Though if Sora does decide to go through with it, hopefully he'll let Lea know.]

Given that they don't even seem to be sure exactly how we were brought here, aside from 'a bunch of idiots messing around with illegal magic', I doubt it. It may just be that our world's magic is incompatible with this world's.