Chris,
The deep piston scratch is a crap shoot,a bet I wouldn't put my money on. The crank pin is NOW at its limits. The decision maker, Let it go. Save your bearings and conrod for spare parts. Only if the crank pin was worn half that, and the replacement piston with good surface finish condition, your situation as it sounds now I would not recomend rebuilding. I repeatedly suggested for you to measure your pin because I knew with a little assistance you would make the right choice here, and appreciate the choice made.
Good luck.
I'm here again when you need me.
Kind regards,
Ray