Automate video production with After Effects CC
You could achieve a certain automation by creating precomps for each clip. Then, drag every alternative file into each precomp and just stack them on top of each other. Now, apply the motion effect (the zooms etc.) to the precomps instead of the footage directly. That way, you can just hide the top layer to that the next image is visible, on which the animation will automatically be applied since it sits in the same precomp you animated before. Alternatively, to make the process even easier, you could script an expression that looks at the index of each layer in your precomp and hides every first layer for every comp, or every first and second, etc. etc. When it comes to the scripting of it though I must admit that this would require a few hours of thinking on my own, so maybe someone smarter can help you with that :D