Capture Card Monitor
Shoutouts to this person, thank you for the skeleton of this script.
Plug this page into your capture card's output and pop the video out for a cheap OBS-style windowed projector on-demand! It's pre-configured to target a "good-enough" quality, namely 720p60.
In respect of your privacy, I won't jumpscare you with permission pop-ups. Click play on the video frame below to connect to a media device.