Wilkerson certainly seems to suggest in her book that some hybridations might be possible (get her book if you don't have it already for more detail).
But I don't know if you can cross-breed from one "group" or "alliance" to another. I wouldn't be getting my hopes too high about A. melanopus X A. ocellaris.
There is at least one (well it has to be two, right?) species of clown known to hybridize in the wild (I saw them diving in the Solomons). I also believe that it is no problem to cross breed A. ocellaris and A. percula in a tank, but their ranges do not overlap in nature. You might ask one of the big hatcheries like ORA if they've tried it.
