You made several unsuccessful repairs. Either:
A) You don't have the resources to do the repair properly or
B) The crank is beyond repair
If it's A, then a good machinist will be able to fix it
If it's B, then a good machinist will be able to tell you.
Find a good machinist and get their opinion. I'm betting that the crank is trashed.
Your option 4 sounds like the worst possible thing to do - you haven't fixed the root problem.
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