[mr0077]

Burgs, that's a good approach, loosen the clutch cover bolts, so there is no pressure on the disc (and replace three bolts with longer bolts to hold the cover in place)...at that point, if the disc is stuck to the flywheel, you can carefully pry the disc loose and re-install the clutch cover fairly easily.
If it isn't stuck, Bill K is right and out it all comes...bummer. Let us know what you find.
FWIW, when it happened to me, it was a new clutch on a freshly surfaced flywheel, and I HAD to have the inertia of the car loading up the driveline while I floored the gas pedal (clutch pedal depressed) to break it loose...the brakes would not have broken the bond. Car went about 100 feet floored before it broke loose.