Sounds like a largely manual task, especially getting just the footage without the effects and animations.
rd: Comp Setter and rd: Scooter scripts might help you, the former in extending each comp by 2-4 seconds, the latter in moving the layer content forward 1-2 seconds for the beginning lead-in.
Then disable any effects and animations and render out each in a lossless format.
Someone may have a better idea.
Kalleheikki Kannisto
Senior Graphic Designer