Something like those switches might be made very cheaply with a 3D printer, possibly a laser cutter, some transparent or semitransparent acrylic sheet, tactile switches and some LEDs. I designed a cheapo replacement for $50 tellite switches and got the price down to about $0.60 Not quite the same, as these are a lot bigger, and getting things down to the desired size might be troublesome. Anyway, here's a little video of my fake cheapo tellite switches: https://www.youtube.com/watch?v=LaenrgPVCjc