Large zip ties do work, the largest ones that fit are the best, they are stronger. I have resqued a couple of people doing this. One forum member used the wire from a spiral binder last year to lash the cogs to the spokes. It worked most of the way home. Then he pushed too hard or started to coast and it broke, but was almost home. He could have rewired it if he had to.
Sometimes bouncing the bike on the rear wheel will unstick the pawls, sometimes not. The lighter may work but I don't know of anyone who has done it. I have unfrozen a large padalock just my cupping my hands around it and breathing on it untill it warmed up. I wonder if there is a way to keep a hub shielded enough so that breathing on it will warm it up? Some hunters say that if the lock on the truck is frozen, in an emergeny you can pee on the lock to get it open. Maybe that would free the pawls but freeze other parts. Maybe a hot drink would work.