There are not many commercial games with color blind support, too.
So far we had no complains about this, allthough i think the biggest issue could be the radar blips.
Things like crosshair or even healthbar will be noticable for color blinds too, just in a different color.
Even someone who cannot differe red-green should be able to see a red dot on the green radar, because it's more oparc.
It would be an issue for them if we'd use red and green dots at the same time.
For other kinds of color blindness idk, but i'm sure if there'll ever be someone complaining, we could offer him/her a quick fix for the radar (some kind of color blind patch).
Since you seem to know something more about this topic Mangley, maybe you would be interrested in doing a colorblind patch for the radar blips. You allready did some weapon skins, so adjusting a few colors won't be a hard task for you, right?