Those date from way back, when PC's only had one monitor. I don't know of any KVVM-switch. So that would be 2 KVM-switches, one fully used and one only for the second monitor (-V-, so to speak).
I see no reason why that shouldn't work.
I have 2 CPUs (both XP), 2 Monitors (LCDs) 1 Keyboard & 1 Mouse. How do I connect everything together? I tried to use a KVM Switcher, but it only supports 1 monitor and if I use a splitter (Y cable) on the KVM on the monitor it makes the monitors mirror each other. I'm trying to use dual monitors for each CPU. Is this possible? I also looked into the software package Synergy, but there were limitations there too. Please advise.