It' s Africa.
As long as you know how to fly a plane, the colour or the logo on the license doesn't matter.
It would be interesting to know what kind of operators are being approached down in M. Is it GA/airline/NGO and light or larger turboprops?
What was your reason for choosing Botswana over for instance Nigeria?
Congo is interesting with many recent start-ups including SAA regional and Brussels Airlines' Korongo. Only that I' m not sure about the political stability of the country at the moment. I recently read that there were some localised exodusses to neighbouring countries due to local tensions.
For those interested in working for NGO' s in Africa, visit "aviation without borders" websites:
www.aviationwithoutborders.org
http://www.asf-fr.org/
http://www.asf-spain.org/
http://www.luftfahrtohnegrenzen.de/
http://asfbelgium.org/
http://www.pzg.nl/
Some of them are looking for volunteering pilots. Some of them (UK and NL) are about to purchase aircraft.
Volunteering for a good cause beats pay-to-work-and-still-jobless-after-that.
Good luck to all.