Thanks! That worked.
PITA but what I would try is -
Remove the collar/ring that goes into the plug well for more access.
Find someone to weld a rod to the extractor.
After rotating the engine to be sure the fitting doesn't hit, run the engine (you'll flood the cylinder) or find a way to heat the cylinder head up.
Try a long small pair of needle nose pliers
Try the extractor.
Try drilling with left-hand drill bit.
Try liquid metal on a rod pressed down into/on the fitting.
I doubt there is enough room to weld a rod to the actual fitting but that would be another option.