A miniature heat seeking rocket might be possible, like an early Sidewinder. Use it to shoot down model jet aircraft.
At the same time, I'm not sure if working on cheap guidance systems is the best idea at the moment - it could be used by Russias and North Koreas out there.
As for TLA - what’s wrong with asking questions? Especially when they might also provide you with a free legal advice wrt ITAR ;)