Along similar lines, for an ex-MRU AONE5, would this be illegal?
MRU-LHR-...-SYD-JNB(x)-CPT(o)-JNB(x)-VFA(o)-JNB
I'm guessing yes, since I have stopovers in CPT and VFA and the open jaw finish is technically a stopover as well, leaving me with three in continent of origin.