I have not followed this thread, so I don't know what it is about. But if you want to implode a smaller item with a longer one across tracks, you don't have to change their order. Try this trick:
- create a temp track above the first parent track and place an empty item that is as long as your longest one (at the same position of course)
- now run the action to implode
- move the resulting item a track below and delete the temp track
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