[almog]

One hackish idea that I had for quick deployment of my mirrorless as webcam, but that I never implemented was to use a dummy battery ⃰ and have a micro controller act as the dummy battery switch. The switch is then controlled by a process that monitors whether the UVC device that's associated with the mirrorless camera is currently being used.

[*] A power adapter that feeds into a battery shaped terminals, thus allowing an "infinite" battery which. It could be better than USB charging while using the battery because USB charging might not keep up with the battery drain. The downside of course might be malfunctioning dummy battery causing your camera to fry.