After you remove the bolt, you start riding, but gently. At the moment you sense that the crank starts to loosen, you stop and walk the bike back. It works 100% of time. Yes, you always hear advice never to do it warning of a damage. If you do it gently the damage occurs in 0% of cases.
Yep. This.
Just take it for a spin around the block. Stay sitting down. If that doesn't budge it, maybe take it up a slight incline. It'll come off eventually.