I am wondering if an old Wooden Rolling Pin with Brass Spikes drilled into it might work.
I can probably pick up an old rolling pin at the second hand store for next to nothing or at a yard sale.
Things like wooden cooking tools are hard to sell because people are afraid of previous contamination.
If using it Manually works, breaking up the pucks in a shallow wooden box, then it can be a start to making an electric driven one with two rollers like a rock crushing roller set up used in mining.
Heck,
You could make a larger wooden wheel with brass spikes like the Dutch Wind Mills use or the old Roman Flour mills used.
They were just driven in a circle either by wind power or by horses and even people.
Now you have my mind workin' overtime thinking of a design, something like a Old Washing machine Wringer made out of two rolling pins with brass spikes.
The two rollers would be mounted horizontally with a space about 1/2" apart with the spikes just touching the other rolling pin.
I think all you would need is a crank on one of the rollers and the other just freewheels
Or you can have them both driven with two Gears and a Idler gear to reverse the rotation on the second roller so they both rotate to feed the material down between the rollers.