It's not worth it. Just set them up on a spare PC or something. I mean were you both going to try to share the keyboard/mouse? and monitors, sharing that too? I'm sure you could set something up, like 2 USB keyboards, and individual key bindings, with keyclone sending the keys about, but you can't both use the mouse afaik.

I just set up friends on my backup PC, which also comes in handy for raid night if my main pc has patching problems, etc.