I did the same mod with my B5-Blue and used a matching Blue vinyl film. If you have the time you can remove the steering wheel (after disconnecting the battery), remove air bag etc., the inserts will pop out completely and you don't have to cut on the wheel and risk damage to your buttons etc.
Having had the 3m brushed aluminum inserts I can say you wouldn't like this if you have steering wheel audio controls, the 3m tape is thick to the point that it will make it "pop" out a good bit on the steering wheel and is not flush at all, and you'll def feel it when working the controls (and it is bothering)
I wouldn't retrofit CF, but since it already has some; I'd like to replace the steering wheel inserts and around the A/C vents ( and a couple of other places I can't think of right now). I wonder if anybody makes a kit that actually replaces the insets that are there now?