Just had another idea, is there a hole in the fork arch, if there is spray PB in there and let sit for awhile then grind off that bolt head, it's junk anyways. Take a drift and drive the bolt shaft down enough to release the pinch wedge from the bottom of the stem, then try to get the stem out of the head tube. Then use the Catfish method HEAT, HEAT, HEAT, might need a BFH blows. Post what ends up working so we all can use that method. Good Luck.