I wouldn't mind rocking Impossible or Demon Boy while I continue to fine tune my Meat Boy/Kid times. So it's a great idea, but we're talking about Team Meat...so it 100% won't happen. :(
I also think their spawn times should be identical to stock Meat Boy, with the exception of Impossible who has tighter air control and spawns as fast as Potato Boy did.
May I ask why would Impossible Boy do so?
(also, Dr. Fetus Boy and Girl Boy would be Dr. Fetus and Bandage Girl, respectively...TIME PARADOX TIME!)