The OWE fare does fly you to PPT, just not from PPT. You can use the LA flight SCL-IPC-PPT on the OWE ticket, however must do surface segment from PPT to somewhere else in Australia/NZ. You can even do it on an xONE4 (eg. HKG-LHR-EZE-SCL-IPC-PPT//AKL-HKG). This doesn't even need the rule change allowing a trans-oceanic surface segment was made a few years ago (IPC-PPT is the pacific ocean crossing, and PPT-xxx is just an intra-continent segment). The OWE gives a lot more travel than the GE product, and while limited to 4 segments in SA, you can buy 2 additional segments (USD 150 per segment in L), though that doesn't increase the 20 segment total limit.