I believe Rishworth in Auckland are still looking after new joiner F/o's.
re: Type rating. I believe that only the Air New Zealand type rating is any use to you. As you are required to have flown the aircraft, before going to Brunei. The Ansett type rating doesn't include any time in the aircraft. And I believe it is still 6 circuits that are required by the Brunei DCA.
Basically 3000 hours min. + turbine time in an airline.
Talk to Jack Priest, Rishworth Aviation, Auckland +64 9 302 0080
Good luck.