The answer is no. You want to grow big like that, you need some mountains to hide in. Even then, it's iffy.
Ironically, you don't have to worry about helicopters, etc. The logistics alone will fuck you. Here you are toting in all that fertilizer etc and none of the locals know what you are doing with it? Busybodies are everywhere, they want to know what you are doing...and they will find out. They will have excellent excuses for trespassing on your property. That's the way it is.
An NPO growing food for the homeless? I can just picture normally lazy government employees leaping out of their chairs to do a photo shoot for the local paper about their indispensable role in "regulating" your operation.
I'd like to tell you that your ideas are workable. But they aren't. Oh, you might get away with it for a season, maybe two, but after that it is jail time. Grow small and stay free.