I look forward to the details! Sam Weigel, a long time commercial airline Captain authored the article for FLYING. He, his wife, and their local guides flew the trip in a pair of 180 hp Cessna 180's. He stated that for a flight this risky they, the tour operators, always took two planes for safety.
And I agree. Even "flying" a sim NZMF is a hand-full to deal with!! And no, a Baron isn't the ideal plane either!