Could you make one model with two characters on it?

So obviously this would come with restrictions, but is it possible to have one model with two characters and split up the tasks between them? Maybe they share the same head/eye movement, but only one of them could open their mouth and only one of them could blink or something.

Furthermore, if this is possible, would it then be possible to make it so that by changing a setting or pressing a button their face/eye movement would mirror each others? For example, by default they both look right at the same time, but after I press a hotkey or something, one looks left while the other looks right.

It's worth noting that I am not the one that is going to make the model, but before commissioning someone to make it for me I wanted to see what was realistic. I hope I posted this all in the right forum. Thanks!