I haven't made soy milk in a long time other than for use for pre treating cloth for natural dyes.
When I make it I soak the beans overnight and then run through the blender and strain....then the mash that's left is the okara or something? It's been awhile and I don't remember the name?
The dry soybeans for tempeh, once run through the mill, seem to very easily lose their skin and what's left floats to the top of the cooking water.
...and yes, garbonzos don't split in the corona, just crush...and they make such delicious tempeh so I sometimes add a few crushed to the soybeans.
To crack the soybeans in the corona I completely removed the center screw that tightens the plates. Ours has burrs and I imagine stone plates would not crack them as well?
Hulling buckwheat though? ...sounds like one would need something specialized