Have you ever ran your hands down real black ebony that has been polished?
nuttin like it on earth.
I'd consider the strength as well. An ebony board will be more stable than maple. An ebony board will have some "spring" in it, but is stiifer and will wear longer as well.
Anther alternative may be to thin your existing fb, and put a layer of ebony on top. I have not had any experience with this setup, I'll leave it to the experts to comment on this method, if in fact anybody actually does it.