The only way you will get onto private land is to go door knocking and seek permission yourself. Second option is to pay for the privilege, i.e Ngamatea Station. Plenty of places like that. Charge a guiding fee and x amount per animal. My suggestion is search the DoC web and find places to go on crownland. I have taken my kids hunting crownland since they were 2. You will be surprised what a 5yr old can handle.
Good luck
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