I do something similar just in a normal pot. Kidney or red beans soaked. You can pop the in boiling water and let sit for an hour if you weren’t organised enough to do it 8 hours before.

Boil beans for about 30 mins until half cooked. Then strain.

In that same saucepan add a Bit of oil, onions, tomato (or half a tin of tomatoes) brown rice, paprika and some stock powder and black pepper. Chili if you want

Budget 1:1 rice to beans and 2:1 water to rice mix. Add more at the end if you need.

Other then the veg all things you can buy in bulk and store. Really filling. Good mix of protein and carbs. Add some frozen veg through or cook and have some on the side. I find broccoli is the best at filling you up.