Good luck mate
All I can say is good luck.
You're going to need a SACAA ATP, jet time, and some serious contacts for the big birds.
You could perhaps get a slot on the TP side with King Air or PC12, if there are no locals suitable for the jobs that come up every few years.
What's the work permit situation there now? I have no idea. I know the SA corporate market is tighter than a frog's ass in water.