Passive AB speaker wire junction

[Axe_34]

I'm currently playing two separate amp heads into the same mono cabinet (not at the same time). I'm getting tired of having to unplug the speaker wire from the back of the amp every time I want to play the other one.

Can a passive junction box like this be built? If so, could someone draw me a schematic? It would be greatly appreciated.

Again, I know you can't play the amps at the same time. And I don't need any LEDs or a switch. Just two jacks in and one jack out.