Stunt casting: Billy Dee Williams as a black Batman

I was just thinking about this the other day and it struck me that in the Multiverse anything is possible so why not a world where Billy Dee Williams was cast to play Bruce Wayne ("I'm Batman, baby") and Michael Keaton was Two-Face? Tim Burton obviously intended to use Williams as Two-Face at some point but never got around to it. Seems now like a much more logical fit but in 1989 the idea of having a black Caped Crusader would have messed up fanboys worse than the idea of having Michael Keaton playing Batman. since this show doesn't care about continuity with the comics at all they might as well go hog wild and just present as many strange and unusual twists on the DC universe and make it fun.