Following on from a customer query, we can confirm that one can install install addressable RGB LEDs/NeoPixels inside a 60 mm diameter arcade button. It’s not the easiest build, so whether one should attempt this is another matter entirely.
I’m not going to cover soldering the wires to the LED PCB in any depth here. You’ll need three wires: 5 V power, Ground and Data. Even though the LEDs I used need 5 V power, they are quite happy with 3.3 V logic on the data line. They need more than 3.3 V power to light, though.
Originally published and slightly modified from Adding RGB LEDs to an illuminated arcade button – We Saw a Chicken …