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This is completely contradictory to the theme of this thread, but if you can achieve a nice 'brushed metal' effect by rubbing with a simple washing up sponge.. The rough, dark green side obviously. I used to do it to iPods, looks nice and covers up existing scratches.
Depending on how deep it is you should have no problem, even when using power tools and buffing rouge you are taking off phenomenally small amounts of metal.
My only suggestion would be to start with the second grade of sandpaper and go slowly.