Emily that recipe sounds amazing, I will have to try it! I don't think traditional block tofu has many ingredients beyond soybeans and water, but I don't have any in the fridge right now so I can't check. I do have some chickpea tofu I'm trying out, which is just chickpeas and water, though I can't report on the taste yet.
Another option is tempeh, which is similar to tofu, but is fermented I believe. It's much firmer and denser, made of soybeans, brown rice, and lactic acid according to the brand I have on hand. It can be a little bitter, but if you steam it before you cook it in whatever recipe you use, it takes the bitterness off. It's also more flavorful than tofu, with a savory taste, rather than the total blank canvas that tofu is. Also very good in stir-fry and worth a shot since it's a little less processed than tofu if that's of interest. You can actually see the whole soybeans in tempeh condensed into the block, whereas with tofu they've been blended up.
The most processed meat substitutes are the ones that are made to taste and look like meat, and they have a lot more ingredients and coloring. Plain tofu, tempeh, and seitan (which I think is made from wheat protein, though I haven't had it in a while so don't quote me!), are a lot simpler. Plain tofu, particularly the silken kind, blends up well for smoothies, so that's a good way to still get the benefits or introduce it slowly. Silken tofu is so soft it will fall apart in your hands, and makes for a really thick smoothie. Firm tofu doesn't liquefy quite as well and has a little bit stronger of a taste, but I've still done it in a pinch and I personally don't mind it, but others might, so go for the silken tofu in smoothies for best results.
There are tons of recipes for making tofu at home with lentils, beans (any beans evidently, though the flavor may vary by type), chickpeas, and soy beans and I've always wanted to give it a try, so I'll let you know if I do this month! It looked like you didn't need anything too special in the recipe I saw, just the lentils/beans and water, but I can hunt the recipe down and post it if anyone is interested. I think I've been able to get organic tofu at my regular grocery store chain, but I'm sure anything like Whole Foods, Sprouts, or a health food store would have a verified organic option. This got really long, but as more and more people go vegetarian, there's more and more tofu options, so if there isn't something you like now, there probably will be someday!