Good idea, and really faster than my suggestion.
Personnaly I created this kind of video by the past directly under photosop, intercaling the video backward in order to smooth the movement.
To-day if needed I would prepare it under Resolve.
I understand it would be nice to have these two options (Loop and Reverse) directly under PTE, but from my point of view, it is not a very high priority.
The need for a multitrack version for images seems to me the sole subject PTE team has to work now.
My second wish is to add a track devoted to the manipulation of true 3D objects, but this a just a dream.