I would first try to contact Ken Enya (
[email protected]) and ask there for a new crankshaft.
I think you can buy one there. If this really fails, think about to straighten it, but this is the 2nd option.
I had an MVVS with an bent crankshaft, it snapped while trying to straighten it in my lathe, there where
hair cracks already in it.
Regards,
Holm