I think the solution to the voice chat requires more effort than the devices the game runs on presently permit. Like a PC or Mac version can route and split audio, thus a PC/Mac version can "route" the audio from Discord and mute discord appropriately, or create a virtual microphone inside the game, so the user can pipe the audio through the game and have the game mute the microphone channel to discord while leaving recording/streaming audio up.
Though I could see maybe a plugin to Discord that could mute the mic.
The colors/numbers bit is a different issue and falls into the "this isn't colorblind safe" problem. It would need to be fixed by using colorblind-safe palettes, and if someone is in colorblind mode, it removes those colors from being options.