it'd be fairly easy to implement something like this using hud text afaik, you could make it as annoying/intrusive as you want, or it could just be in the corner of your screen. I didnt read this whole thread, but it seems like for something like that you could have it stay on the screen until the player acknowledges it by typing some command, just to make sure they read it.
That being said I have 0 time to actually make that, so someone else would have to do it or it'd have to wait for a long time