protein is high....seeds are also high in protein
it would be a real pain IMHO but if that was my only option...I would look into making "rice balls" as a cheap stable and offer the block as a supplement.
The answer depends on what you plan to achieve, how big your setup actually is and how much time and money you plan to invest.
The rice would offer a good stable of carbs and in "ball" form you could easily blend in extra things to supplement.