Some professors at Yale had a similar idea and set up a charity that allows you to directly transfer cash to very low income families in Kenya. They're doing a bunch of randomized control trials (RTCs) which are the NGO equivalent of A/B testing for outcomes. Highly recommend them if you're looking to support something like this directly (no pun intended).
This is about the best news I've heard all week. Thank you VERY much for pointing us to this.
The costs of Basic Income test programs in the third world are SO damn low that I've been thinking for a while that it's possible to run some fairly credible privately-funded trials. Really pleased to find someone else doing it so I don't have to try to learn the NGO side of things :)
http://www.givedirectly.org/