Agree,
You might luck it with the Angolan CAA, can't remember their name?? but you could get in serious trouble also!
We got hit up big time in Huambo from memory, as ours was U/S that day and the controller wasn't going to let us T/O back to Luanda. It took a lot of bull ****ting to get us out of there!
Also it's part of the professionalism of being aviators, it's mandatory in that airspace! What other rules are you going to just ignore!
You either be part of helping African aviation step up or you keep it known as good old dodgy Africa, where know one gives a ****!
Your choice.