Don't take this the wrong way Mac but if I was putting the amount of work involved in doing what you mention I would be doing it to a genuine set not a poor quality Chinese replica set as it just doesn't make sense and to be honest I'm quite surprised that you've bought them in the first place.
A lot of the A2 interior aluminium items are anodised ( door handles, handbrake button, gear knob and surround etc) but if you look at the aluminium sheet that is pressed onto, and covers the plastic Sport centre caps you will see that they are slightly grooved where they are turned and then lacquered which is what I would personally be redoing if I was refurbishing a set.
Ideally a lathe would be the way to cut the lacquer back and take a small amount of aluminium off too, much like refinishing diamond cut alloy wheels before re-lacquering them.
If you don't have any original caps they can be bought used and looking a bit shabby for not a lot of money and as long as the clips are intact, could be made to look new again with the right approach which surely would be the better option as the difference in quality between the originals and replicas really is night and day?
D