Progress is slow here at the moment.
Quick tip don't try ball milling in a glass vessel no matter how robust it feels, the glass will give. Even when done gently by hand.
I tried this to get the Anhydrous MgSO4 out of the Duran Bottle I had dried it in. Unfortunately it had caked around the sides.
Net result was that the bottle slowly went crazy paving. Upside though was I did get the lumps out of the bottle and transfered to another container one way or another, just wasted the bottle.