I am not familiar with those grains. You might also check into proso millet seed. Which ever grain you choose, try finding the nutritional composition on the internet. Be sure to look for the composition by weight and not human dietary needs.
I would try to grow both. When making homemade foods, the more diverse diet is better. There are grains that you can grow in limited space. Grains are a better source of natural fiber and greens have more vitamins.
Mealworms, like you said, are easy to raise too, but I suggest using a...
You still want to have some sort of grains or greens to have a balanced diet. But you can definitely save a lot of money on food with them. They are extremely high in protein and calcium
I suggest also setting up a black soldier fly bin to grow animal protein for them. This is a small compost bin where you allow the black soldier fly larva to compost kitchen scraps, animal droppings, and anything else organic. The larva then crawl out and you harvest them and feed to your...