I had held back expressing my excitement toward Stu's 4-LED knob board, because I feared that without a source for translucent knobs I would buy it only to have it sit in my spare parts bin.

You're aware that you can just drill holes in the factory knob and buttons, and have a ring of pinpoint lights on the knob and central pinpoint lights on the buttons, right? That is a good temporary solution until you can get translucent buttons.