What about using a hose pump for this. Easy to drive, slow but reliable and few moving parts to wear out.
This is a pump that utilizes a rotor that compresses a flex hose to move fluids. A cheap model for plant watering should be available somewhere.
What about using a roller system to compress biomass for pre-drying, pre-shredding treatment, something like a cane mill or sorghum press.
Just got another idea. Hook a rider and bicycle up to a shredder that works like a sorghum press
(usually powered by a mule at the end of a long pole).
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