This reminds me of a tale from years ago, before I was diagnosed. One of my hillwalking mates, also non - diabetic used to make his own biscuits -cum - flapjacks from all sorts of things - wholemeal flour, soya flour, oats, assorted chopped apricots, dried fruit, nuts & seeds, chopped dates, a bit of spice, sometimes a small amount of syrup or sugar, and so on, depending on what he had available at the time
Then he baked them quite hard so they had a longish shelf life and did not disintegrate when carried in a rucsac for several days. They were, he said "not for frivolous eating"