Oh nice! I've been doing this on the Mac side with BetterDisplay, but on the Windows side I couldn't find an equivalent and have had the awful Dell software installed to do it there. This'll let me dump the Dell software! Thanks!

For Windows, I wrote SimpleKVM. I'm proud of the little monitor diagram it shows. Keen to hear your thoughts if you get to try it.

https://github.com/fiddyschmitt/SimpleKVM