LED buttons can be combined with the ano face (guess you mean the ones by 303?) as there are transparent buttons available and you could cut small pieces of colored plastic (of whatever source) and insert inside the knobs, above the LED, to get the wanted color).
The effect on the knob is IMO pretty minimal though, due to very small holes in the knob.

Can't help you with anyone local to help you with encoder or other fittings, sorry.