And even those still require a
https://www.store.level1techs.com/products/p/dp-repeater-hdm... per port to make it so the computer doesn't detect the monitor switching away.
I have a Level1Techs hdmi KVM and it's awesome, and I'd totally buy a display port one once it has built in EDID cloners, but even at their super premium price point, it's just not something they're willing to do yet.