Doubling Up a Paint Transition Animation

 

Start by making a Transition Context from a hand picked set of source images. Build a paint action sequence for the paint style you want. Run the Path : Convert to Paint Synthesizer : Convert PASeq Context keyframes to Embedded Autodraw menu command. 

You now have a set of embedded bezier paint action keyframes in a single new paint action step in your PASeq. Mute the old paint steps you used to build the beziers (unless you don't want to). Use Action : PASeq Timeline : Time Compress / Expand menu command to time expand the keyframes and associated embedded bezier paint keyframes.

At this point you have a key-framed paint animation that is independent of whatever is inside the source area.  But you can route transition effects frames based off of the original keyframes into the source area.  And then build new paint presets that take that transition effected source and paint it on top of the embedded bezier painting.

So you have doubled up your paint transition animation.