Guts...
Burundi blurrrrdy marvelous. Beer cheap and NGO skatties willing....
Rossair operates two twotters there as well as one in Kenya out of Loki and a whole herd (group, gaggle, shoal?) in Algeria. Heard Algeria not so great though with living conditions only a cockroach could love but management not too bothered by that. Try to stick to the humanitarian stuff in Loki and Buj and you should be fine. If you're lucky you may even get a DC3TP rating in Loki.
Good luck...