I would just swap it for the GTR's. Here's DIY:
DIY: GTR Red Start-Stop Button Swap out
What are u gonna paint on it? I don't see any screws or anything like that so I am guessing you just have apply pressure to the clips and remove the housing... how about masking and then painting? That would save u the trouble of removing the button itself (and possibly damaging it). Just my 2cents