Do we have vfio enthusiasts here?

Now that I made my second GPU boot into Arch Linux (inb4 I use arch, btw. jokes in the comments), I also set up a windows vm with GPU passthrough.

When I plug the monitor cable into the hdmi port of my passthrough'd GPU, I can see windows os on the screen.

My problem is that I want to have it inside of the same monitor without changing the from hdmi port to hdmi port manually, but "softwarely" (neologism ftw).

I read about looking-glass in the arch wiki (I use arch, btw. + On a serious side note though, I really like the arch wiki. It is very straightforward.), but I could not get it to synchronize with the Spice display server.

Does someone know how the solution to this problem?

Fuck concrete and the likes! Just fuck it. If I enjoyed grinded stone so much I'd move to fucking Romania or camp inside the Chernobyl dome or something.
I want every concrete building to have a disclaimer saying that 'you are now entering a fucking Faraday cage - the contractor who built this place hates puny nerds like you with a vengeance!'