I’m hoping for something that connects to WiFi via Zigbee/Z-wave (Smart Things Hub) as I’m equipping the house with other smart things running on those protocols.

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Hmm this is one mechanism for the lock and handle and in what looks like roughly a 50-60mm backset.
Limits your options on whats available in NZ
To hopefully fill the existing holes and gap - you will have to look at an integrated system.
Something like a Yale 3109+
https://www.yalelock.co.nz/en/products/keyless-entry/electronic-digital-door-locks/3109/
Or a Schlage S Series
https://www.allegion.co.nz/en/products/electonic-security/residential-security/schlage-s-6000.html
Problem is that these dont typically come with much remote smarts. The Yale has a Bluetooth add-on but thats about it.
Many smart locks are in the form of deadbolts. The Schlage Encode is one of the first wifi enabled smart locks as a deadbolt. They are awesome and I would recommend it.
Given your door looks like wood, depends how much "fixing" etc you want to do. You could completely remove the existing lock and handle, fill the door and install a new handle with a smart lock deadbolt above or you can leave it as is and just install a Schlage Encode above? and not use the existing lock but keep the door handle.
-- opinions expressed by me are solely my own. ie - personal
If you want to retain the existing door handles and do not want a battery powered solution then you can install a electric mortise lock and integrate with proximity card access control or you could keep the existing setup as it is on the door and install a electric strike instead on the door jamb and integrate that with proximity card access control.
Just bumping this to see if anything has changed over the last 9 months or if i'm still stuck trying to remediate the holes and install something "from scratch" so to speak.
To open a standard lock, you need to know how to pick it.
To open a smart lock, you need to download the exploit to your phone and know how to click on "Open".
I'm hoping not to have to run any additional wiring so not too interested in the electric door strike.
Understand what you're saying about electric locks security wise as well, but I live in an apartment complex and only about 40 people have key tags to get into the common area that has access to my door. I'm not too fussed.
I just want to do the least remediation but do want to re-do this door lock with a smart one.
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