It depends on the implementation.

If there’s no voice chat, text based chat participation is considered optional, and the in-game community isn’t toxic, then I might get chatty.

Maybe you can do something with the tampermonkey extension to catch when that audio is triggered and have it do an api call that your script catches?

I don’t know if that’ll actually work, I know of the extension but have never it used nor am I skilled with Javascript but it seems feasible.

Maybe conky but probably not?

Conky can be used to display text on your desktop, including grabbing stdout from a program. I’m not familiar with calcurse but if it can dump text output of what you want, that could work.

The big caveat is that conky doesn’t work with wayland. It’s a work in progress (according to the arch wiki, anyway).