While licensing is definitely harder in Germany you also do not have to retest or do anything else to keep your license. It’s actually a problem that it’s pretty hard to take away the license from old unfit people (and the German government actually blocked EU legislation improving that).
OR just do some grappling, it’s really a lot of fun and just great overall.
But if you just want to fake being a martial artist I recommend just buying a black belt and wearing it everywhere. It’s just as stupid, but cheaper and less painful. Or maybe instead of elf ears you can buy cosplay cauliflower ears to wear…🙄