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Simply animate the bats in a pre-composition, then use that pre-composition as a layer in the main composition. Likewise, aniamte the door opening as a separate comp so it can be re-used as track mattes for the bats and the actor.
So, I'm not crazy after all... It's too much work for a single comp. I was hoping I was missing some cool trick! I was thinking of putting the bat animation on a red background, since the footage of the actor opening the door is night-vision (green)... Good plan? Then I can key out the red.
You've twice said something about color keying that makes me think that you're missing the point of color keying. You only use color keying when you have footage that was shot against a uniform-color background and you want to remove that background. You do not need to use color keying when you're creating elements from scratch.
Ah, right... for some reason, I was thinking I'd need it in a precomposition, so I don't end up with just a black background, which would cause problems in the second comp. When it didn't work out the first time (in a single comp), I started to completely overthink how to get the results I'm looking for.