I forgot about the clutch pressure plate being an issue, and assumed you had that off as well. So unless you've got to the 6 bolts holding the flywheel to the crankshaft, please don't apply the BFH yet.
I was assuming the flywheel was still stuck after it was unbolted. Since the engine is seized, probably the easiest route is remove the pan and the crankshaft, complete with flywheel and clutch still attached, as has been suggested.
