It is so not the best case scenario, but can you bring a protein bar with you and eat it in the bathroom or something? You can eat it fat and if you pick a good one, they can be somewhat filling. There are a couple that are uber high in protein and hav almost no sugar. You really have to read the label carefully because most are junk. My favorite is an atkins one that has something like 18 grams of protein and 10 grams of fiber, but they are expensive.
I understand about the realities of work and breaks, laws sound great on paper, but a paycheck is not optional.