Is it possible to apply lean green supply chain in developing countries?

There has been very little done on the prospect of applying Six Sigma processes in the developing world but what has been achieved in countries like Brazil, China, Malaysia and elsewhere is that the programs adopted by large multinationals that invest in infrastructure and training of their personnel, making it possible to obtain the financial benefits desired.
So the answer to your question "Will it be possible" is Yes with sufficient funds and training to achieve the results required.
Pat