I would think that "wriggling him around" might be having the complete opposite affect that you want. The more you mess with him, the more determined he will be to dig in tighter.
Hopefully the heat mat will help...and if you don't want to cut open the couch or other similar drastic measures...you may have to resign yourself to spending as many quiet hours in the room as possible without messing with the couch at all. When he finally feels like everything is still and quiet and there are no more threats....then he may venture out to explore. (Unfortunately, they are WAY more patient than we are...and this "waiting for still and quiet" could take a few hours or a few days!)









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