You don't. All you need to do is identify as Maori. That's good enough. We are considering changing our status to Maori. There are many privileges and benefits associated with this change.
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It depends for what purposes you want to identify as Māori. Proof of descent is required for electoral and some other purposes.
For example: https://consult.health.govt.nz/hiso/...21%20FINAL.pdf
I don’t think seeking or discussing the reorganisation of representative bodies per se is treasonous. It is just democratic debate or expression.
The Westminster system, on which the NZ system is based, can include non-democratic chambers, such as the House of Lords in the UK.
I also think only NZ citizens should be able vote in elections in NZ. Australia has a citizenship requirement, except for British Commonwealth citizens who arrived there before a certain specified date. NZ citizens can vote immediately in UK elections.
With no authority from anyone else, I think the Maori Party “declared” Political independence by wanting to establish a Maori parliament. In effect they want self government within NZ. Even within the context of the English language version of the Treaty of Waitangi, I am not sure if this would amount to an act of treason against King Charles. Would a declaration such as that even be classified as an act?
If this were treason, it could certainly shut down debate. Every opposition political party wants King Charles to change how he governs the people in NZ.
However I am no expert as to what constitutes high or regular treason!