If re-crystallization only, I would suggest this route. I haven't done this by myself as I didn't have cocaine in such quantity and needs, but it must work 200% considering all I know about cocaine hcl and its physical properties.
you may try with smallest quantity first just to see how it works and adjust this route. 2-3 gr - ok.
1. for small quantity as 2-3 gr you need a round bottom flask, 50 ml.
2. put your cocaine inside and add acetone in small volume, may be 3-4 ml of acetone per 1 gr of stuff for the beginning. i really don't know cocaine hcl solubility in hot acetone, so you need adjust it by yourself.
3. heat your flask with cocaine in hot water. you may use hot water pan or hot water stream, whatever. i guess water T shall be around 50-60c.
4. add more acetone in small portions if not dissolved completely. and repeat step 3.
5. throw all this liquid in PP crystallization bucket and move to the freezer.
important: crystallization bucket must be sealed to avoid convection with air in the freezer!!!
job done.
for bigger quantity scale proportionally.
you may thank me with a couple of grams of your stuff if it helps.