I purchased a Rami that had the controls (slide lock, hammer, decocker, and barrel) polished (not plated). Since they were polished (not plated) they were less effective than the original do to the serrations all being smoother (less grip). It works OK on a Rami since the gun is a carry piece and is already chunky. I wouldn't go that route on a full size 97.
I don't know how a chrome plating would affect the tactile grip of the controls? If it were to lessen their grip, I'd opt not to do it, especially since it is for show and not to improve performance.
My 0.02,
Toby