Hopefully a reverse drill bit will work. I've even had luck with a dab of epoxy on a nail head and slowly backed a bolt out once. But, you're right, since it didn't go in and jam and just the sealant is holding it may help with it's removal. Hopefully it won't hinder it turning. Yes, take a pic I'm sure others have ideas as well. Good Luck! Once you're back on the road this will all be in the past....
