NVIDIA lets you make custom desktop resolutions that your monitor doesn't support, and they sometimes work. I upped a 1080p monitor at work to 2160p so the mouse would move between multiple monitors more naturally

It's in NVIDIA Control Panel > Display > Change Resolution > Customize

Looks like they've updated it since I used it to autofill the extra junk. If you double the h/v resolution, then double the scale in display settings, everything should look the same