Anything can be done. I seriously doubt it would pay, maybe chrome? I do have 2 sets from Stainless Steel Brakes and they still look pretty good. 20 or 30 years later. I'm debating with myself to spend the coin for White Post to do a third set.
Whatever they plated the caliper with it is starting to show some rust color staining to the plating color in spots. It was worth evey penny when I did it considering how long they have lasted. Too bad Stainless Steel Brake stopped providing the service.