Can I easily switch to a external webcam when I'm in a Virtual Classroom?

I work with a Microsoft Surface Book in tablet mode when I'm in the Virt. Classr. That way I can easily write stuff on a shared whiteboard on my pc. But in that mode my camera is at the bottom; giving everyone a nice look up my nose. I managed to use my phone cam as a external webcam with DroidCam, shared through my Wifi network. In Skype and Zoom I can switch to that phone cam. But now I would like to switch to that phone cam when I'm in the Virt. Classr. Anyone tips or ideas or solutions?