Platers would want the wheels completely stripped before they can plate them.
In addition, platers don't like polishing wheel rims because the spoke dimples tend to damage the polishing mops so they may be reluctant to take the job on.
In addition, there is also the issue of hydrogen embrittlement to consider.
My favoured platers are Niphos in Crewe, founded by two ex Bentley plating shop workers
Arwyn