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Most chrome plating companies will do polishing, the last quote I got on a water pump was $250 to chrome, about 30% less just to polish.
Advanced Plating in Nashville is a great vendor, Street and Performance (S & P) in Mena, AR is great, and the link to a great alternator chromer is: http://www.metronchrome.com/
I have the tensioner half done. The water pump would be a challenge due to the size, shape and rough finish. When the pump seal fails how would you repair it? The Meziere pump is already polished and could be sent back for rebuilding so the same housing would be returned.