Very good idea, but it will take more than not for profit grocery stores. The for-profit Ag & Grocery industries will work hard to see this fail. They are very well funded and politically supported.
It will also take effective independent producer supply
Not for profit Livestock grain legume supply chain?
The corporations the dominate these industries won't quietly accept any change that threatens their massive profitability.
They have had decades to hone and refine their dominance.
https://mstdn.ca/@pinhman/115968042569243772