If you want black rims, suggest checking with nearby V owners first, see if someone wants to swap their black for your silver. It's worth a shot. Some like the contrast the silver provides with black tires.
As already mentioned, powder coating is the way to go to change color. But there's some effort involved. And the expense of new bearings and seals. And you'll need paddock stands for the bike to be stable with the wheels off (if you don't already have them).
I had my VFR wheels powder coated, usually about 75 a wheel. Even after all the work, expense, etc, you still have to worry about a mechanic monkey scratching them up when they put new tires on.