This is what I have been looking at. Kinda pricey but looks like it will stand up well.
Couple of the minions bikes would work well for power.
Hit/miss engine would work well as long as fuel available.
If you're unarmed, you are a victim.
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Grew up grinding wheat for bread on the Country Living Grain mill.
It does a fantastic job.
A nice small DC motor high torque low RPM with the right gearing would work fine with one solar panel and a car battery would do wonders.
I dropped the need to look into that sort of thing when I found my grain maker had zero issues milling wheat powered my my arm.
If I needed to grind corn - I would be making sure I could get the mill powered by a bike or the something besides a hand crank.