With 26" wheels, it's not a DL-1, but something more like a Dawn Tourist, but that had conventional EA3 wheels, and you have something else (and I'm not sure what). As you suggest, what was imported to NZ may differ from other markets.
If it originally had rod brakes (which I don't doubt) and it now has drum brake hubs, then those hubs are not original; so that throws your 1952 date out the window (sorry!). So there is also no need to consider the rims original; it could well have been a Dawn Tourist with EA3 wheels.