A typical bike-riding leftist urbanite who also happens to be a hockey-crazy Western Canadian.
There’s a kiosk-style compositor called cage that would work, at least for your main concern.
Then maybe use waypipe over ssh to do your work in the background. Alternatively, you can research setting up a multi-seat display manager, but I think you would need at least 2 GPUs to implement that properly.
I wouldn’t trust the analysis either; luckily most PKGBUILD scripts are quite short and simple. It would take significantly less effort to hand-audit every single file I’ve gotten from the AUR than it would to reinstall Arch.
The gutenprint package might have the driver you need. Otherwise, the AUR is your best option.
Refrigeration cycle scoffs at your mere 100% efficiency
rsync -aftw