Nonsense!!! An FAA license is as good/even better than any other license in Africa!
Let us say South Africa. I keep forgetting it has not totally slipped into the quagmire.
If you are NOT a South African you will be allowed to validate it for the length of your current Medical. As to a renewal after that the rules keep changing which limits the amount of times you may do so.
If you are a South African with an FAA License, that dog wont hunt.
Maybe that will be a bit more accurate.