Do I submit to 1p on true any% if I use 2p without a friend?

You wouldn't have prove that you're doing the controls all by yourself. Apart from that, I highly doubt you would gain any advantage.

This is unprecedented, but is something I have thought about. You would have to record the run with a hand cam in order to prove you were doing everything. On a side note a single player 2p run would be very interesting to watch and play.