Restore Video from Audio in Premiere
If the audio track was from a video clip in premiere, and was not replaced by the after effects comp, it should still be present in your project, and you should just be able to use the Match Frame command to find and resync the video to your audio.

Even with thirty clips, it shouldn't take that long if you use keyboard shortcuts.

Something like:  

Select the first piece of audio in your timeline.
Set your in point on your timeline "i"
Press "f" to match frame
Press "." to replace the video at the correct point

(and repeat)