Hi James - thanks for posting - I would post more but sadly don't have much to say most of the time.
On the subject of colouring wheels, would it be possible to anodise NSX wheels, and if so, would this provide the type of fine finish that powder coating can't achieve? Just a thought.
I found this: - https://fractory.com/aluminium-anodi...inium_Benefits which may be of some use in the future.