“I suspect it will be slow.”
I know it will be slow, but I don’t have a “blow up” machine (Seed Discombobulator(tm)). I just need to know if the rolling pin works.
First... you must have a way to control them when you try to roll them. I wound up putting the seeds between newsprint to keep them from flying everywhere.
Second, they crack, but the meats don't separate well enough to either winnow them with air, or float the hulls away from the meats.
That's my experience. Maybe you can get it to work better.
/johnny