I had the same issue with wanting to have my chrome Reutter luggage rack powder coated black to match my car. Powder coat process will not stick to chrome. Sandblasting may pit the surface of the wheel and powder coating will amplify the pitting (kinda looks like a paint job with 'orange-peel' finish).
I had to take my luggage rack to a shop that does chrome plating. They did the reverse (chemical bath) process to remove the chrome and expose the nickel plating underneath. Then I took it to the shop that does powder coating.
Pricing for de-chroming and powder coating will vary between shops depending on how they operate. Some shops may need a certain number of pieces to do chroming or powder coating by batch. This keeps their process cost effective. @Impala