Rice glues, and additives to mortar, plaster, and other crafts have been known for thousands of years. The "amylopectin" found in "rice soup" is similar material and characteristics to what you get from fermented cactus pads. I have use rice in several projects, seen the use in China as a mortar additive. It is an expensive additive for a entire house
project and not an "indigenous material," so for most project I question is applicability, other than for a traditional restoration project, or some other special application.
Regards,
j