Well, that's not fusion, that's polyrhythm. Sun Ra's "Space is the Place"
does exactly that (melody in 5, bass in 4 and I don't know what the drums
are doing). The only drummer I know who has made a systematic practice of
this technique is George Marsh, who has recorded a couple of times with
Denny Zeitlin (another out-there inventive player) but is otherwise
obscure. Odd time combinations are rarely used together the way you
describe; I have no idea what song you're referring to with one player in
7/4.
Polyrythms are usually expressed within a count of 16 or 12 so you can hear
a regualr 4/4 if you choose, even though there are other combinations of
accents going on. The feel comes mostly from Africa, so you could call it
Afro-fusion, but it's pretty much mainstream now except when the counts are
odd, as you describe-- in which case it's too unusual to have a genre name!