FWIW thinkpads have a function key on the keyboard to mute the microphone. With indicator LED.
I don't know how it is implemented, may be in software, may be done in firmware. It won't be perfect but at least it gives you a visual indication that your mic is (or should be) muted.
I don't know how it is implemented, may be in software, may be done in firmware. It won't be perfect but at least it gives you a visual indication that your mic is (or should be) muted.