This will be very hard to do…
Did a experiment using the feedback hack a while back for motion-streaks…
… it should be possible to do something similar in the Simulation branch using the Extrude Node… For every face get the delta and dot that with the normal and if it is negative then extrude to previous frame’s position… something like that - not sure how to add up the extrusions across multiple frames and how to deal with changes in faces where the motion path changes direction… Will require a lot of work and experimentation… but should be possible.
Sorry for unsatisfactory answer.