It can be done with a standard A5 or A7 head. It's not a stock option, and you'll have to build the interface yourself. There are several mods required of the radio, but nothing serious. The radios operate just fine with the head removed, once you provision them for that.
What will happen is, each radio will remain in whatever the last state it was in when it was talking to the control head. Disconnect the head to connect to the other radio, and if it was in scan, it will remain in scan.