Okay, so here's a simple scenario:
My monster knight has two smaller, independent monsters standing on his shoulders in bones on his back.
When he swings his hammer, his back is exposed and the riding monsters should Z order move in front of the body. Is there a way using the existing features to 'slip' the monsters riding between the right layers of the Knight's spine skeleton?
These creatures are not formally in the Knight's heirarchy and I am not using Skeleton Utility.