Your enthusiasm is commendable, Dog but perhaps those N-registered aircraft were bought in the States and flown back to Africa, not flown to Africa and bought right there on the ramp, when there is a very big difference between those two things.
Also, a Caravan (C208) burns Jet A, available everywhere, when this man is asking about a C206 or C210, when that means finding Avgas for the long flight across Africa.
Still, what do I know? Let us know how it works out if you try this, Mike.