What are you looking to be redone. My machine shop in Oregon charges around 800 to machine the head. I provide valve guide seals. A block betting bored out and decked is around 900 with me providing new pistons, rings, main bearings and connecting rod bearings.
So rings are a wear item that coincide with the cylinder as they make a sealing surface. You would need to hone the cylinder in the block. Assuming the cylinder walls have no scaring from that debris. Then get new rings for That piston and slap it in.
Also if whatever damaged that is in you pan it could have messed up your crank. Highly doubt it it’s probably laying in the bottom. Did you break off a piece of your spark plug when doing plugs?
You can replace one piston they will be the same size as long as either motor has never been rebuilt. The question is how are you going to hone the block for the new rings. Also you can’t buy just one ring you have to buy a set and OEM ones are a couple hundred bucks. There are OEM alternatives...
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