I thought about this
This was an option I had thought about. The pieces are so thin to begin with and since I can't go too deep with the etch, it isn't a process that seems to work.
As for the polishing, This is something that I might try. I found an etch resist ink that can be removed with acetone. If I fill the etched area with an enamel and bake it in, then strip the remainder with acetone, it might work. I get the ink on Monday, I'll try it, what else do I have to lose, except a couple parts.
Thanks