On a one world explorer, Tahiti is only accessed through SCL and requires a surface segment since Tahiti is in south pacific and SCL is in south america (thus SCL-PPT-SCL is backtracking).
There is a QF codeshare on Air Tahiti Nui SYD-PPT but that is not allowed on one world explorer (but is on global explorer).
No one world first class service to NZ, except for LAN SCL-AKL-SYD. Subject to other constraints you could fly first to Australia and business for the 3 hour flight trans-tasman.