If the SA CPL/IR wasn't lapsed, you would simply need training as required to pass a JAA CPL skills test, which you could do in a twin and get the ME at the same time. Then a 15 hour JAA IR conversion course and IRT.
Instead, you'll have to do a JAA CPL course and ME/CPL test and a 55 hour JAA IR course and IRT.
You can price it out yourself at the schools of your choice, but after you do, I think you'll give second thought to renewing in SA then doing the conversion route here. On back of a fresh SA renewal, the JAA CPL/ME would be a breeze and the IR 15 and test would be too and the saving will probably more than fund the SA refresher and renewal.
If you don't go back to SA for renewal and instead do the full JAA CPL/ME/IR, look at doing the CPL in the States because there are a lot of FTOs there that do JAA CPLs.