I think Sanergy is a great idea- they have a set up infrastructure that is operated by local stakeholders who know the areas. Their franchising has gone well and I've personally heard numerous stories of communities being uplifted not only with health and sanitation improvements because of clean washrooms, but because of the increased employment that it brings to communities. You can read about their Fresh Life Operators here: http://saner.gy/our-work/fresh-life-operators
Would need someone with a deeper understanding of how Indian informal settlements work in comparison to that of Kenya or East Africa, and it could take time to set up operations in the local economy. Microfinance Institutions also face a considerable amount of regulation in India, so having someone with institutional knowledge about funding micro enterprises would be helpful as well.