Wednesdays in November seem to have business reward availability on LHR-KUL-AKL on MH (very few seats), there's also a BA/CX reward combination in Premium Economy (slightly more seats on some Wednesdays). Unfortunately, the protection you get by keeping everything on a single ticket is the price for not using the voucher, unfortunately.
Of course, the other option is to take a punt on a transit point, and if it all goes wrong you buy a cash ticket. I'm not sure the gamble is worth it.