Teams added something like this recently, hold down ctrl+space to temporarily unmute

https://support.microsoft.com/en-au/office/muting-and-unmuti...

I went the other way and wrote a utility that mutes my mic when I type.

I got a headset that mutes when I move the mic up and unmutes when I move it back down: jabra evolve2 65, comes in mono and stereo. If you want an over-ear option they have evolve2 85 but that's like $500

I found MicMute[1] has anything I want from such a tool.

[1]: https://github.com/SaifAqqad/AHK_MicMute

Also would enjoy such feature for bugger meetings as hangout setting