Hello. I can guess that you have multiple camera clips cause you have some Fx sets on each, which you change during performance.
Here is small solution from me:
Drop your capture devise to some "N" layer (preferred on top, you can set layer name to e.g: "Camera Feed"), launch clip, set layer to bypass (to prevent original feed comes to composition), and forget for a while.
And now go to your layer with multiple cameras and replace all clips with "Video Router" (available from Sources tab), to avoid reset of FX stack, envelops etc. I recommend to use drag'n'drop to green info bar in the Clip property panel of Clip which have to be replaced.
Each Video router have to be set in this way:
* From drop down menu Input, select your layer with capture devise e.g. Layer N "Camera Feed"
* Uncheck - Input Bypass/Solo
Done! Ones you connect different capture device, go to layer N, put it there and launch.
All Video routers now will send feed from layer N processed with all that FX, Transformations and envelops which you set for each router.
Composition -> Save
