Out of the 5 vegan and 8 vegetarian options, only the soy protein is cheaper than meat.
I might replace one meal a week with the soy protein, but I'd be concerned about long term effects of phytoestrogen, especially on growing children? Mind you many foods have some hidden soy 'bulk' nowadays.
https://www.hsph.harvard.edu/nutritionsource/soy/ relates to understanding of health benefits/detriments of soy.
Moreover, it is well established research that most modern western diets contain too much animal products. If you think that living vegetarian causes so much problems, you need to explain how many cultures who live almost exclusively vegetarian (e.g. In some areas of India) without significant health problems.
How about beans, lentils, and frozen peas?
That said, I merely posted this data because I looked it up and found it interesting as a comparison.