Hi Stevesmith,
I think you could solve this by using the Record and Execute routine options for the process modeling robot transport controller. This way you can first record the initial robot actions, modify those to use the double gripper as you need, and then execute that routine in process modeling.
You can check out the robot transport controller tutorial for more information on this. The relevant part starts around page 17.
https://academy.visualcomponents.com/lessons/robot-transport-controller-manual/
-Este