Alas, me old mate "Chubby" Frank Fyfe is no longer with us. If the NZ Folklore Society tape archives still exist there may be one Frank made of me singing Davy Lowston while we were driving from Wellington to Otaki Beach to record a guy Hector McDonald. Hec' was the "First white boy" born on the Wellington West Coast. Unbeknown to me, Frank held the mic' over my shoulder, while I was driving. With the wind thru' the open window, it sounded like I was singing in a screaming gale.
You'll find music, lyrics, discography and a couple of sound clips on the NZ Folk Song site, also a link to Frank's Hertitage site. You'll see there is some controversy as to the location of Open Bay, where they were landed. I've tried to build "blue clickies" to help your NZ geography, but can't get 'em to work. Best I can do is:

Go to Multimap World Maps and type Haast in the Place box, and New Zealand in the Country box. I suggest you use a new window, so you can come back her. Next, click [Find]. When the next screen comes up, click [-] to get a half-decent looking map. Whewww....

Open Bay Islands, which Frank (1970) favours are under Jackson Point. Head [S] one screen on the map, and you'll find Secretary Island, suggested by McNab (1910). I'd go along with Frank's choice between these two locations, but..

Hit [S] on the map once more. There's a wee blue circle above the "C" of Codfish Island - that's Solander Island - just a big rock stack, and there were sealers stranded there for a few years in the early 1800s. It's my punt for the location. Te Wae Wae Bay appears as Open Bay on some very early charts (from memory) - and since I live on Stewart Island (the bump alongside Codfish), I'm parochial. I'll check the details, track down some URLS, and post 'em here. It's almost dawn, and I've been having a wonderful trip down memory lane. I learnt Davey Lowston from the Songspiner's 1967 EP. Frank Fyfe learnt it from me on that car trip to Otaki. Phil Garland learnt it from him, and the more recent Kiwi folkies learnt it from the three of us. Actually, Kat and a few other Catters heard me sing it on the 'Net a couple of years back.

I'm Chuffed to see the overseas interest in the song - keep spreading it round the World!

Cheers - Sam - Stewart Island (NZ)