Camera trigger for 2 servos

I have setup a switch to trigger a servo and used the camera trigger function. I have this servo on aux3. I also have a servo on aux4 but i want to use the same switch ln the transmitter to trigger both servos at the sane time. How can i do this?

Why not use a Y cable like the ailerons one and only one aux? Another chice can be to use radio mixes.