Can you buy replacement decals for the HVAC knobs on our SSR's? If yes, where?
How bad are your controls, did you need just one area or the entire section of all 3? Can you post a picture so I can see how bad they are?
It can be done to some extent but the problem is that they will not look or work like OEM. If the gray base paint is worn you would need to paint them and then put either a water type decal on them or a vinyl.
The problem is if you paint them then it would not allow the light to shine through the back as it does now. Even if the current paint is good and all you want is a vinyl overlay the same problem would occur, no transparency. If you use a water type decal then you are limited to use a color other than white, so again the transparency would change and the OEM look.
Might not be a big issue, having it look decent would probably outweigh what little light is there anyway. I always have the halo light coming down from the mirror when I drive so there is always some light in the cab at night. If that works for you I can probably work on something for you, but if you want to keep the OEM look and function then I would have to pass.