Push-to-Deafen needed for Proximity Voice games

Many games have proximity voice, but you may also be on discord with your crew, so a push to deafen would be very helpful. Here is a sample use-case:

I am on discord and in a game with proximity voice as well. Someone in-game is trying to talk to me, but I cannot hear them or talk to them because of activity on discord. 

Currently I have push-to-talk in the game, and push-to-mute on discord set as the same key, however this doesn't silence those on discord, so their chatter will overpower the person in-game. So ideally, I can just hold a single key that does push to mute and push to deafen on discord, and push to talk in the game.

A toggle-deafen does exist, but this is too cumbersome to use in tandem with a push to talk button in-game.

I saw there is another push to deafen post from 4 years ago, but proximity voice in games is much more popular now, and I felt the specific use-case deserves its own thread.