C in straight to C out switches aren't that common yet, but C in + C power supply passthrough to HDMI + some USB 2 out KVM thingies are getting fairly common for not too crazy prices like https://www.amazon.com/MLEEDA-Computers-Compatible-Thunderbolt-Delivery/dp/B0BJPTQJRF/ref=psdc_13983771_t4_B08F42NXGC

Two separate C to HDMI/DP+USB docks with separate cables running to a traditional HDMI/DP/DVI KVM can still be cheaper though.