Powder Coating them clear is a decent option for that becuase it's pretty tough, but that is what turns yellow over time. If you want to save yourself some serious man hours on polishing, I'd look at powdercoating them "silver." A lot of powdercoating houses now have colors that they call "chrome" etc.. that are pretty close to the real deal without all the headaches. If it has to be polished, I'd ask JBB what automotive clear coat type paint he would use and go that route.
RD