In reply to Gibb Sahib:

FWIW, I did a fair amount of research on "The Beautiful Coast of New Zealand"; it's at https://balladindex.org/Ballads/BaRo017.html.

You're doing the same sort of thinking that I was doing last spring. I don't know how much it will help. But I hope you keep doing it. :-)

The other thing that might be worth trying is New Zealand census records. Can we verify the existence of "Frank Woods," who was the source Neil Colquhoun cited?