The problem here is that there is little wrong with beans based vegan food. The issue is expecting school cafeterias to ever make anything decent. UK school food was basically 5 star gourmet meals when I was a kid. I have no clue why the US lags so far behind. Also my schools had meat, halal and vegetarian options, as veganism wasn't a thing in the 90s. And we still occasionally got tuna or chicken on the 'vegetarian' stuff because it was more like 'semi vegetarian', white meat ok, no red meat.