Has anyone tried an award routing like this?

I know the adage is "if it tickets, it's valid" but I am too far out from my dates to try bookig at this juncture. Would this be a valid n.america to southern Africa zone award?

EWR-IST-KGL-JNB-MRU(destination)-JNB-GRU-FLN(stopover)-GRU-IAH-LAX