I'm guessing you've moved on past this but I'll reply anyway. It is possible to polish or abrade a chrome coat on plastic to remove scratches, but it's finicky business. If you polish too deeply, your chrome is gone and you're hosed. The thing is, you don't have to polish completely through the scratch. If you round off the edges of the scratch, you can make it hard to see because it's the edge of the scratch that catches the light. If you can get ahold of an ultra-fine FEPA-grit 4000 silicon carbide paper and use it wet, it will work for your application. I've only bought it from Struers, a company in Denmark. You might need to start with a very light touch-up with 2400 grit, then hit it with 4000 for a few seconds, wash it, dry it with clean cotton and look at it.Anybody have any idea what to do to fix the chrome?
You can also get a real fine diamond paste and apply it wet with a tight-weave cotton cloth. I'd try either 0.5 or 0.25 micron diamond and again, go slow and clean it periodically to see if it's working. Struers also makes a colloidal silica liquid abrasive that works great on plated polymers but it's a pain in the ass to use. It is 0.05 micron silica suspended in water and it cuts predictably, but if you let it go dry, it polymerizes and leaves a white film so you have to stay wet and clean it often.