Yeah, you don't need to sing the whole thing.

I probably should have mentioned that there is a quiet "whoosh" noise after the first vocal "segment" that you fail, but you can get rid of that by doing another short recording where you sing the first few bars and then combining the two recordings. Or, if there is an instrument track that is silent when the whoosh happens, you can isolate the whoosh there to subtract it from the other tracks.

I should look through the FMOD banks to see if I can find that whoosh, because then you could just invert+add that sound, and only do one recording, with no singing ever.