Training to fly for aid organisations
I would say consider the safari and game park outifts in E Africa too as a stepping stone. Your time in Arusha will have shown you who some of them are and the Cessna 206 or equivalent flying they give you will provide extremely useful single pilot command time in challenging marginal VFR conditions that may earn you some respect in the future. Try the Foxes in Ruaha for instance, I'm sure most operators of that nature can help advise on how to get the Tanzanian CPL etc. Could be well worth it. Good luck.