(1) doesn't seem like it should be too hard, relatively: there's likely a direction you're mostly staring at, or keep returning to (especially on audible cue),

(1) doesn't seem like it should be too hard, relatively: there's likely a direction you're mostly staring at, or keep returning to (especially on audible cue), so you can 'just' adjust that one to be direct-at-camera, and add noise or show original otherwise. (I can't do this, but I say relatively easy in the sense that you're already doing the CV and adjustment all the time, so it's just an adaptation to turning it off or doing it slightly differently sometimes based on aspects of the CV.) Personally though I just plan to print a widget to fix my webcam to my microphone stand, so it's at a more eye-level height and moves in and out of the way with the mic.