I've never tried it, but I've heard of guys drilling a hole thru a bolt and installing a grease zerk, threading the bolt into the clutch, then pumping grease into the cavity until the pressure pops it off.
Another thing I heard, was to tip the sled on its side, pour the cavity full of water, then install a bolt (no hole in this one) and let it freeze. The pressure from the expanding water/ice will pop it off.
Good luck!