Thanks Todd! The Frame Restorer plugin worked for me. I first tried exporting the two keyed tracks as a Photoshop sequence but Frame Restorer had a problem with the alpha channel:

So I exported the clip with everything composted, deleted one frame between the two clips and told the Frame Restorer to “Restore Missing Frames” and it worked! I don’t think anyone will notice I cut out a pause in his talking now. Thanks!