QED products are outstanding but not cheap, they make amp switchers, speaker switchers, source switchers and other such accessories. More for audio purpose than for computers.
As Mucks said, tell us why you need to have this kind of facility.
Does it have to be 6 channel on both systems.
Can you not just switch by unplugging and plugging, is it that difficult?
Are you going to use both systems at the same time? I think very unlikely, nonetheless your input is required.