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The new knobs arrived today. They were 4€ each and are very well made. I am currently waiting for some spacers to arrive so I can continue the soldering. The first picture shows the signal rings in complete darkness and running on 24V. They are really not that bright
Don't want to distract you from finishing your project. May be for your next summer project, you can consider building something with RGB LED rings with individually addressable LEDs. With an Arduino, you can do some nifty visual effects such as have the lights follow the rotation of the knob (you'll need a rotary encoder or some other means of detecting the knob position) or make a VU meter out of the LEDs. https://www.sparkfun.com/products/14966