Just read a few threads down that SIN-HKG-JNB(CX)-NBO(BA) is possible, but I am doubting availability in late June / early July.

So technically, this should work?
SIN-HKG-JNB-NBO(stop)//JNB-LHR-CAI(stop)-LHR-JNB-HKG-SIN

As for me, this route seems good except I will be passing by LHR more than twice?
YUL-LHR-NBO(stop)//JNB-LHR-CAI(stop)-LHR-YUL

Would appreciate all help.
Thank you.