Super! And it works.
The only issue I found was a small bug in displaying the bounding box frame in the editor when the pivot of the sprite is shifted. I.e. frames are still shown as if the pivot remained in the centre of the sprite. Clicking on sprites and selecting objects works correctly.
And also a bit frustrating to set the pivot in case the sprite in the atlas was rotated when packing. I think visual marker will solve this situation.
How it works :