You might be able to take something like https://wowopenbox.org and https://www.splashtop.com & use WoW Open Box to grab & organize the Splashtop screens and possibly even remove the title bars from the windows. If I recall correctly WoW Open Box, though initially developed for WoW, can actually capture the window of multiple games/software and if a given game/software cannot currently be captured it could possibly be added. It is an Open Source project so even if the developer who started it doesn't have the time to add a given feature or support a given game/software anyone could either help add it or fork it.
Note that Splashtop may or may not be the best tool for this but it is just the one that comes to mind... After trying multiple options it is the tool I use at home to remotely control my wife's & kids' PCs and my old gaming PC and it does pretty well with 3D games. My old gaming PC is in our "kid office" and it is headless and it generally is fine for me to remotely control my F2P ArcheAge accounts on my old PC in the kid office that I use for farming and labor...
Edit: While it started centric on WoW there is a link more focused on multiboxing just about anything:
https://openmultiboxing.org/
If there is a feature missing or a game/software that cannot be controlled feel free to join and contribute.
Should be a really nice way to handle any headless video windows on a main PC and that is where I would start.
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