>>> flow chart tech support with a "buy a webcam" cherry on top

>> I feel safe in saying that they don't want a video of you at your keyboard typing stuff. An exploit video is a recording of your screen, not of you.

> if any of the exploits require anything that isn't on-screen (USB or other HID, key combination), requires a reboot, or anything done before Windows has fully booted, means one must have an external camera

That still wouldn't mean "buy a webcam" - if someone has had a mobile phone (smartphone or dumbphone) from recent decades, it likely had a camera included.