That's an interesting concept. Certainly you can't do a lot of things that might be considered weird or obnoxious, so you're pretty limited in what you can do in public without seeming strange. One thing would be to wear clothing (when the weather is nicer, of course) that conveys the ideas of black superiority in some way with text or imagery. It's a tricky proposition, because especially in these super-polarized political times, it's quite possible that a black person might react suspiciously or negatively to something that you are totally sincere about expressing. Your heart's in the right place, just be circumspect and consider how your actions will be likely to be received.