The only well-reviewed DisplayPort KVMs I'm aware of are from Level1Techs: https://www.store.level1techs.com/products/kvm

Not cheap though. And also not 100% caveat-free.

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.

I have Linux (AMD RDNA2), Windows (NVIDIA Ada), and Mac (M3) systems hooked up to my L1T DP1.4 KVM[1] without any other gadgets and they all work fine. What problem(s) are you trying to solve/did you solve with the EDID cloner?

1. https://www.store.level1techs.com/products/p/14-display-port...

Without the EDID cloner, when you switch the KVM away from the system, it receives a monitor disconnect event. When you switch it back, it receives a monitor connect event. There are OS settings that help make it so that the windows end up back where they started, but not all programs support this well. With a EDID cloner in place, the computer never detects that the monitor shifted at all and so nothing gets repositioned and apps just carry on.

Say more?

Cheap DP to HDMI adapter cables are easily available if you need an HDMI port for that.