These are hard questions and worth exploring through an innovation process lens. Organisations with a record of interventions to note are Practical Action. Issues are scale and the impacts of aspects outside the control of the agroecologist such as climate change, infrstructure and energy prices. Opportunities exist for low tech innovation but also high tech ones too, see CEH Crop Map and the NERC ASSIST programme.
Levels of economic autonomy have to be able to capture and use innovations and hence why I think the innovtion lens has much to offer this work
Best reagrds,
Nicholas
Nicholas Corker