This would be a very good idea but you need to be careful to ensure you get grains which have not been genetically manipulated. I know that bajra, sorghum, corn have been researched to create hybridised and genetically modified varieties for example by DuPont. If you can be sure you are getting the real natural variety then go for it, if not then I would avoid.
It's ridiculous how much our staple foods have been tampered with. I'm struggling to find anything which has been left untouched. It's not even enough to just buy 'organic', as I have seen genetically manipulated grains sold under organic certification.