What exactly do you plan, buying a 172 and giving it away to a flight school? Naive belief owning an aircraft and making money by letting a flight school rock the poor plane?
Business in ZA is tough and will need a ZA license, as stationing an aircraft there will most probably render the validation path unmanageable. There is one guy from Eros airfield active in this forum, so he may bring some more light into current situation down there.