Need to output broadcast to USB so can use it as a web cam (don't ask) on a laptop and use that to broadcast.

Has anyone done this and what device have people used? Not sure if HDMI to USB or SDI to USB? Have used Black Magic Web Presenter, but is a bit clunky to set up and also used a cheap dongle, but concerned that it might not be reliable.

Wasn't sure if there was something a bit more substantial but simple I could use?

Thanks