Agree get 'em powder coated. If you're planning to go for black use the wheels you have but think white needs to be the multi spoke type (tourismo).
You're gonna have to pay for it all again if you like it and choose a more permanent solution.
What is this wheel paint, not heard of it before. All the Nova boys round here must use normal aerosols or emulsion paint!
BTW, powder coating doesn't cover all the blemishes, I had some old Lancia alloys coated in gold for my twinny, looked good from a distance but pitted up close. Make sure they are blasted and prepared properly. Cost about £100.