Hmm... USB-C is complicated because there are a couple different ways it's used to display video. If your computers are able to output Displayport over USB-C I

Hmm... USB-C is complicated because there are a couple different ways it's used to display video. If your computers are able to output Displayport over USB-C I would think you should be able to utilize a Displayport KVM and USB-C->Displayport cables on the input of the KVM and the same cable in reverse on the other end. I think the hard part is figuring out if your computers all push Displayport over their USB-C ports or not.