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rigid body collision and using goals to 'shape' the position of fragments

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hi guys i'm having a bit of an issue here - i've got a rbd sim using bullet and a glue constraint.  Basically a bullet passing through an hour glass...

overall its working really nicely and sims nice and fast.  However theres some chunks that sit on top of the larger unbroken piece at the bottom.  I cant suss out how to refine the collision of this shape sadly :(

so what i want to know is if its possible to use a goal for the simulation - i'm fairly sure i've seen this done many moons ago... I want to be able to take the pieces on top of the unbroken chunk and sort of force them and move them out of the way... so the simulation tries to work towards a final resting position?  I hope i'm making sense here?



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