Cunning, Not sure if ML-KG is an ETOPS sector. Probably is, and may indeed increase the track miles. May even push XR aircraft further north into even stronger headwinds. Someone else may know. As i mentioned previously, I'm sure that the powers that be will have scheduled in a tech stop in case the winds are to strong on a particular day.
Have you considered since NJS were doing KG-ML that there's been a huge mining boom in W.A. Just take a look at the FIFO work around W.A. at the moment and the different types of A/C they are using. KG is one of the towns that has been affected by this boom.
Cheers