I am not sure how easy it is to “take over” controls of a helicopter. Are their two control sticks? If two people are switching between one stick that could cause troubles in terms of speed and height. Think of two people trying to switch steering a car at the same time.
When riding front seat of the Bell 206 I was away from the controls moving in front of me by the pilot in the other seat until instructed to take control for a minute
and a Quik “Rock-Paper-Scissors” ?