First answer is,do you prefer to go for 1) coherency or 2) stylish effect?
Option 1) Look the rest of the switchology and standardize.
Option 2) Change your mind, go for coherency and go to Option 1.
#-= IMHO =-
Honestly, I’d paint the central holding element black matte, but leave the rotating parts bare metal.
The knob would benefit for a thin white line in the middle of the inclined slope, like the small rotary on the other side.