OK Thankyou GibSpmuh for that great advice.

I don't really need to include any of AU or NZ in the trip, I just thought I might return home before completing the trip. So if we remove that from the equation it probably works out easier.

Work will get me to Tokyo and then I will probably be working in NZ a little later. I thought to bridge the gap between cities I might go traveling.

Therefore I could do my RTW and then take the return home from Tokyo (that work will pay for).

Great way to start a RTW isn't it? Not having to buy flights to get you to the starting city.