I had a theory about how I could get up to the third floor on the level Switch Tag Team, but it was impossible to test on single player. Well, graveash and I recently discovered it was indeed possible in coop and completed it successfully in a couple runs, however it turns out it wasn't saving nearly enough time to make it worth it (at least the way we were implementing it). Wanted to post it here just for documentation sake though, maybe this could be used elsewhere or implemented better and it could be useful.