I eat buckwheat shoots in winter and early spring, and I see no effect of photosensitivity. Shoots and seeds are completely different foods, except for the mineral content and perhaps vitamin E. Even that changes in practice, shoots minerals are far more bio-available. I eat alfalfa and fenugreek sprouts, pea, sunflower, and buckwheat shoots. I am fairly sure that any grain shoot is a nutritious food for chickens, specially those that can not range. I would exclude only red and kidney bean sprouts. For sprouts, I would go cheap and sprout corn (it is even a fine sprout, even for humans), for shoots wheat, barley, BOSS or oats should be fine.