I don't hold with fussy eating either, but if I would try to give ds2 anything with dairy, peas, beans (of any type), lentils, nuts all I'd end up with is another epipen used, a trip to the hospital and a child who sees food as something that is dangerous and will hurt him.
I don't trust mass catering to be able to cope with special medical needs. He gets a healthy packed lunch, which he eats with his friends, some of whom also have packed lunches, so he doesn't feel isolated about his allergies yet again and we eat a cooked from scratch meal each evening together as a family.
He, and others like him do not need to have it pointed out any further that they will not enjoy the same relationship with food that others take for granted.
If school meals became compulsory (which smacks of socialist over-control of the 'uneducated' masses), I would have no option but to withdraw him from school for lunchtime, which would be a major hassle as I work FT and the school is > 3 miles away.