I'm no expert Adam but i'm unsure if you can do this DIY without problems. Are you just thinking of something temporary?
I too might be looking to get my wheels refinished as someone has let me down with a purchase for my R112s. Was going to buy the R113s in all Black but if i don't find a buyer for my R112s i may look at having them powder coated.
Don't they have to be properly treated so that they stand up to the elements? I would imagine a simple paint job woud start to flake and easily chip, showing the standard finish.
Could be wrong.