Lots of beans and bean-like foods (chickpeas, lentils, peas, soy beans) can be made into a variety of shapes. If you have a pressure cooker you can even cook them relatively quickly in mass and freeze most of it for later. No idea how much that costs in your country, but it's supposed to be cheap.

You can just make regular bean "soup", or you can "fry" them in a pan (specially lentils). You can eat chickpeas like popcorn or you can mix them with flour and something sticky (overcooked rice if vegan, egg whites otherwise) and make burgers. Just remember to put something oily like olive oi or butter for taste.

You can also do some really low-nutrition despair foods by mixing wheat flour, salt, water and butter, and frying that in a pan. It's not healthy, but it's filling and easy to make, tastes like bread. But of course, if you add to this you can make other cool stuff like pancakes (less salt, lots of sugar, baking powder).

All of the fried stuff get a very homogeneous consistency so they might be fine for your sensory issues.

On the matter of taste, you just need a lot of seasoning.