I take the point about validations, and something should be done about that.
If a foreign pilot, who has an SA CPL/ATPL wants to fly a ZS aircraft outside of the RSA, I just don't see the problem.
Rossair Europe and Zimex, when they were around, all had non-European crews with JAR licences working for them. Plenty of N registrations with non-American crews etc..
Once that aircraft and crew are outside of RSA, it's no longer a domestic issue ie. every pilot for themselves.
Oh yes, and it really is alot easier for a South African to move to another country than for foreigners to move here. As yet this countries immigration process and requirements are far from transparent. Beautiful country though.