Tesmart has a kvm with one usbc port but only uses hdmi as the graphics protocol. https://www.tesmart.com/collections/for-4-pcs-1-monitor/products/tesmart-4-po

Tesmart has a kvm with one usbc port but only uses hdmi as the graphics protocol. https://www.tesmart.com/collections/for-4-pcs-1-monitor/products/tesmart-4-port-hdmi-kvm-switch-with-usb-c-input-4k-60hz-audio-output-usb-sharing-4x1-hdmi-kvm-switch-for-3-hdmi-inputs-and-1-type-c-input-black https://www.tesmart.com/collections/for-4-pcs-1-monitor/prod...