Perhaps these people may be good to contact
http://www.beesfordevelopment.org/what-we-do as I think they do excellent work. Had a long chat with them at the National Honey Show and some of their success stories were just great. They seem to work more on cooperatives rather than individuals and yes top bar hives and log hives were generally the order of the day for parts of Africa.
They told me in the past well minded people have set up people with framed hives, but then they need expensive extractors, wax, more frames ect ect and what has tended to happen, they make top bar hives or log hives and use the framed hive for something else as it is more use as a box for something else.
They say it’s not the equipment, but the information and organization to start a cooperative from the first hives, collecting the honey and then transporting to market, reinvest in more hives ect. They can start small, perhaps only a few people but as more people see how the cooperative works, more people join in and some of them now are pretty much commercial.