Nope, no other options, crank must rotate. With oil pan off, use a prybar between crank webbings and main caps to pry crank end to end back and forth to determine if there is end play. No movement would indicate that it is siezed on a main bearing. If you have end play, it could be pistons or rod bearing stuck. A bearing failure will usually leave a clue such as discoloration or "dry" cap, sometimes debris in oil pan. If rods will rattle side to side, look to pistons as the problem.
If the pistons are stuck, pour some MMO into each cylinder to break loose carbon. It will take awhile. If you find evidence of water in cylinders, corrosion will lock it down solid. A last resort if the crankshaft is already bad, cut the crank at the last rod journal with a cutting torch.
I had a similar situation on a 322 that had thrown a rod, Had to pull pan and start unbolting stuff until crank would turn so I could remove transmission.
John
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