I'm using this kind of setup since ~ 3 years and i'm super happy with it. But used "another" approach with udev rule, you can find it there: https://gist.github.com/r0xsh/8dbaf16231ad01028a255bd80bcbd7...

I got a DeLock KVM switch recommended by the shop vendor (who actually did spend a good 15 min understanding my need and doing web searches), and quickly confirmed by ChatGPT as a solution to my need (plug the work macbook alongside my personal linux tower, no exchange of data between hosts, no driver needed, and do a KVM switch).

I actually end up using 2 mice and switching the keyboard from bluetooth (for the mac) to usb (for the linux) because I can't get usb working through the HDMI. And the screen is limited to 120hz (instead of 144hz) because of the switch quality or the HDMI cables, I do not know (it lights up and works for a minute and then goes black a few seconds every few seconds, losing sync).

In the end it is more tedious and less featureful than just plugging the mac to the screen via a USB to HDMI cable, switching everything from the screen (and doing the same mice / keyboard juggle than above), because at least I would get the 144hz and save the 150€ from the switch. I can't return it anymore because the 15 day window has passed so I still use it, it's a little bit easier to switch from the remote control than from the screen anyway, but that's expensive just to switch from a different button.

I use this usb/dp switch https://www.amazon.com/dp/B098TVP9ZL

no monitor switching needed, although i did hook up a hub for more usb ports.