New Grain Alliance? Sounds like a cartel out of a dystopian nightmare if ever there was one.
In all seriousness, what's very concerning is that people seem to think that making minor reforms to a grass-based food system will somehow solve any of the problems. The planting of grass has been destroying forests for thousands of years, concentrating wealth in the hands of landowners for thousands of years, enabling slavery and serfdom for thousands of years, depleting the topsoil and drying the climate for thousands of years... and switching to locally-grown or hand-harvested or heirloom versions of those annual grasses isn't going to fix the fundamental problems with grass-based agriculture.
Even if the population could be fed by old-fashioned cereal farms without big machines and diesel fuel, grass seeds lack vitamin C, have a horrible calcium-phosphorus ratio, and even lead to arthritis and intestinal issues in some people, not to mention the opioids that make them addictive and probably alter brain chemistry in ways that we don't even understand. Cereal crops are not suitable as a staple food for a healthy population, let alone sustainable at the scale that Europe would need.
In order to solve the problems in the modern industrial food system, people need to be willing to let go of their grass fetish and begin reforesting and eating what the forest produces. Every ecosystem given suitable conditions eventually matures to forest; humans have the ability to shape that forest into one that's highly productive and meets their material needs. Unlike industrial-scale grass-based agriculture, a tree-based agriculture doesn't lend itself well to centralisation; no big ploughing or harvesting machines, no synthetic fertilisers, and economical at just about any scale. Diverse food forest systems can be planted anywhere trees will grow, from city parks to remote villages. Incorporating native vegetation ensures ecological resilience and separates the cooperative forest model from the colonising orchard model. Food security? Climate action? Wildlife habitat? Water conservation? It's all there.
(Legumes are cool and all, but peas and lentils do not make a forest.)