Looks like a euro plug to me.
I have some power outlet sockets on the back of my Marantz amplifier just like that!
(Nothing to plug into them though).
I had a device that had a power pack with those sort of pins - I managed to buy a socket that matched from a $ shop sort of place in Italy I think it was, for a euro or so.
Then you just need to wire it onto an NZ lead.
That link to the socket on Aliexpress looks like the right one as far as I can see.
Link to world plugs and sockets
I agree making a little lead is probably much better than those wobbly adapter plugs - they always seem a poor fit.
Naturally make sure the power adapter is ok for NZ 230v first.