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I had some success with submerging the bases in some water and leaving them in the water for a couple of days. The wooden bases soak up the water and you can then removed the miniatures easily depending on the materials.
The water method works. It may take a while but it's knife, hammer and chisel free...so you ought to have all your figures and fingers at the end of the process.Leave em to soak for a good while. Work smart, not hard.
I’ve tried that, but the water always got drawn up into the paint and taking it off the feet and legs.