Any of the multiboxing software will basically do this for you.

Push your hotkey for follow, and the slaves will follow the leader.
Depending on your software, it might send a command for follow.
Or it might send a keybind to all toons, which has a wow command to follow your focus; with focus changing on the same key that swaps one leader (and the region they're in) for another leader.

I'd recommend taking a look at the software forum.
IS Boxer has a 7 day trial, and that is the top software, in my opinion.
But there are other options, so take a look and see what looks good for you.