i have always loved the Pentax colours.

You are obviously a man of great taste
Personaly I would leave them gold as they go well with the Rothmans colours and it gives you the option to switch back to Pentax colours when you get some good bodywork to paint.
If you do the wheels I would have them painted but what ever you do send them to someone who knows what they are doing, the magnesium has a protective finish under the paint which can be removed if the wrong blast media is used.