Not OP but the KVM-over-IP devices I've seen work on multicast and thus are pretty terrible for network performance unless you have managed switches with packet

Not OP but the KVM-over-IP devices I've seen work on multicast and thus are pretty terrible for network performance unless you have managed switches with packet inspection. They also don't play well with many WiFi access points too. I've not seen any KVMs that work via unicast for < £100. Whereas you can easily get a HDMI capture device plus VGA to HDMI adapter for < £100. If you know of any KVMs that don't use multicast then I'd be interested to know because I've been looking to move my CCTV display.