I know exactly what you are going through in finding reliable information on the internet. What you are dealing with is the new information vs. the old accepted ways and information as both are being strongly represented there at this time.
Pajarita's delivery is harsher than mine but she consistently strives to provide the best available information from documented scientific sources, as I also try to do. So if you just don't read any emotion into her words or ignore the delivery and just concentrate on the information you will see that she is providing a lot of accurate and valuable information.
As to the items that you mentioned all of them are fine for your birds to eat, just make certain that the beans and lentils are thoroughly cooked first. I also would have t tendency to not overdo the kale due to its high iron content.
Allow me to provide you with the link to the best list that I have found so far as to what is or is not safe for your birds. viewtopic.php?f=8&t=12521
This list begins on page two of this thread and goes into foods, houseplants, trees, woods, as well as household products. I hope that you like it.
I go by a listing of ingredients contained in the mix, paying close attention to the order in which they are listed. The more of an item that is used in the mix the closer it is to the top of the list. So if it lists safflower seeds third and whole wheat sixth then I know that it contains more safflower seeds than whole wheat. I look to see how much sugar is in the product as well as chemical compounds, the sugars they like to try and hide from you, and the chemicals are usually unpronounceable words. I don't like sugars, chemicals or soy products. I prefer all organic products for my birds as well. I never buy colorful seeds as the are the highest in dyes, sugars, soy and artificial chemicals.
If you go window shopping and find a few seed mixes that you like and provide me with either the link to the product or the exact name of the product, I will be happy to look them over and let you know what I think of them.