To get the SA CPL/ATPL you must do all the exams in SA. Once you have done the JARs I would be tempted to go straight for the ATPL exams in SA, and don't bother with the CPL's. (In SA they are 2 completely different exams - no "frozens").
There are a few correspondence notes you can get, try
aeronav or
avex for a start.