Maybe this would work except for the $$$$$$$$$$$$.
Again the idea is to have the pilot/passenger/camera all on the system at the same time with only two jacks available. So plug this adapter in the Paassenger side and then the Passenger and camera would plug into it!!!!
Aircraft Spruce
This high quality adapter converts a set of radio or intercom mic and phone jacks into 3 sets. Sets are one, three and five feet respectively. Great for adding a pair of headset to the back of the aircraft without requiring major installation.
Description Part No. Price Buy
TRIPLE HEADSET ADAPTER JB-14 11-00680 $78.85
Frank @ 1L8 ... RV7A ...