I took a little time today to get my hardware fix and decided to draw up a schematic to the bi-color LED circuit published so long ago buy Fabien Bénattou.
Disclaimer by me: I did not design this. I only drew it to show it's simplicity. Very clever design that most with a little electtronics experience can build.
With a little more circuitry, you can see how this can be an insert directly to the Disk ]['s ribbon cable rather than something wired onto the analog board.
All signal designations shown are attached to the Disk ]['s Analog board. Hope you like the design. Maybe make your own? :-D Enjoy!
Footnote: A kit for this is available from ReactiveMicro: https://www.reactivemicro.com/product/disk-assembled-or-kit/