Hong Kong is 4 hours behind Wellington
Best overlap: 12:00 PM to 6:00 PM in Wellington is 8:00 AM to 2:00 PM in Hong Kong.
If you set up a recurring sync, 12:00 PM to 6:00 PM in Wellington (8:00 AM to 2:00 PM in Hong Kong) is the natural home for it. Hong Kong is 4 hours behind Wellington, but you still share a generous 6 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to. Remember that Wellington shifts for daylight saving and Hong Kong doesn't, so recalculate the overlap after each clock change.