Hi the best team in the globe

I have a friend who wants to do a RTW , it seems best that the itinerary is best suited to the One world and not star alliances , however any advise is always welcome . Also would it be cheaper to buy the rtw D in Hong Kong , and just fly Y to HKG from MEL.

Here it goes Mel - phnom penh-hkg-yvr-jfk-frankfurt-mel

I am aware that one may have to fly to HKG as there may be no direct flight from Mel- to phnom penh?

Kind regards

ELO