Is this another option? Just thought I'd throw it out there to see if it's edible for birds. It contains added vitamins and minerals though, so maybe not?
https://www.drharveys.com/products/...-ground-dehydrated-vegetable-pre-mix-for-dogs
Sweet Potatoes, Carrots, Potatoes, Broccoli, Peas, Green Beans, Celery, Beets, Parsley, Dried Yeast, Lecithin, Alfalfa, Dried Kelp, Ground Flaxseed, Tricalcium Phosphate, Dried Ground Fenugreek, Dried Ground Fennel, Dried Ground Ginger, Dried Ground Peppermint, Zinc Proteinate, Iron Proteinate, Vitamin E Supplement, Manganese Proteinate, Vitamin A Acetate, d-Calcium Pantothenate, Thiamine Mononitrate, Pyridoxine Hydrochloride, Riboflavin Supplement, Biotin, Vitamin B12 Supplement, Vitamin D3 Supplement, Folic Acid