I did successful tests with multiple shapes that were triggered by the luminance of another layer that had a wipe from black to white. (I'm this technique for easy changes of direction, shape and length of transition.)
So do to the final transition, I was going to chop up the incoming and outgoing videos and mimic what I did with the shapes. However, I'd like to be able to make it a template so that once all of the hard work is done, I can apply it easily over a cut of 2 videos. Any advice in this? Right now I'm having trouble figuring out how to map the A and B video layers to layers inside a precomp. Hope that makes sense. The biggest problem I'm having is coming up with the terminology to make successful searches for help.
I am setting this up for multiple editors of different skill levels, so I want make it rather user friendly once done.