Boring or honing it out isn’t going to work, unless you are willing to get oversize pistons. It’s almost impossible to bore a hole and not remove material that you didn’t want to. The bore usually has taper and out of round to a small degree, really hard to dial it in perfectly, without taking a cut. I’m not saying it couldn’t be done, but it would be easier to remove the plating by hand, and not remove material that you want to keep. Fine sanding drums and take your time.