(sorry if I am not speaking english to anyone).
I admit I was mightily confused until I read back and re-read the posts you're referencing.
The problem I foresee is the fact that even multi-die LED's only come in four colors, either RGBW (Red/Green/Blue/White) or RGBA (Red/Green/Blue/Amber), with in-between colors being done by wiring two die in the LED together (Red + Blue for purple, violet, or pink; Green + Blue for teal, "veridian", and Ultrasabers "Sunriders Destiny").
Even if it could be done, seems to me it would lead to a veritable "octopus nest" of wires between the power-supply (along with any resistor, buckpuck, driver, or soundboard) and the LED.