KVM MITM

I’ve had an idea and I have been hashing it out the last couple days. I want a smal piece of hardware that runs basically a MITM, but a physical one. Something like those old keyloggers that you plug between a PS/2 keyboard and a computer. If it already exsists, please link me, but this is what I want it to do: Features of the KVM-MITM: Ports: (2) DVI or VGA; (2) Ethernet NICs; (4) USB or/and (4) PS/2 Ports <– Half male, Half female