Oh geez.
If you haven't already filled in too many of the Special Stage music slots (provided they're using different songs like in BTS), I'd imagine that to be the best place to put myself and others who'd wish to join the project.
Completely understandable. Should simply send a couple of my more recent works your way? If I don't make the cut, it's only more reason for me to improve. If I were to make the cut, and you guys simply couldn't find a place to put me (or you reconsider), that'd be fine, too. Either way, no harm done.KgZ's suggestion isn't too bad, but I'd imagine it might throw off consistency within a given zone, making it feel a little awkward as a whole. All that said, though, if you don't want to add any extra composers into the mix, I honestly don't blame you one bit.