Yep. Just do it on the cable, heat shrink some wrapper around it and make it extremely obvious on the box. Try walking Grandma through what cable and charging brick to use over the phone when she calls you while she's at walmart

I recall coming across the color guide for the various features, like blue for USB3, and red for… power delivery, maybe?

But then one day I was on AliExpress or Alibaba or something and seeing that you could just buy cables from some manufacturer with whatever color you wanted. And I lost faith in the reliability of color id for cables.

You are moving the format from words to colour as a solution? I need a USB cable Bellend... "Oh, what color?".