Zoom to OBS, but change OBS runner's camera

Trying to help a friend. They have two web cams at their location, one is their face and the other is the overhead studio shot. They're running a Zoom meeting and want to capture that meeting since it auto changes faces depending on audio. They also want to be able to switch between their cameras, prioritizing the overhead studio shot.

I imagine the best solution is to:
1. set a display source for Zoom, laying it out small (to account for someone screen sharing and changing the size)
2. set a source for the overhead studio shot
2. A. overlay that on top of the Zoom
2. A. 1) set up a hotkey to turn the overhead studio shot on and off.

They'll have to manually change the camera and remember which one's on as Zoom changes focus, but it's better than editing in post.
Let me know if this is a possible approach and what you might do differently.
 
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