i think most people are actually very good at differentiating between an individual (in this case the Queen) or even the current inclination of an institution or idea from what it might've been in the past
The Monarchy now isn't what it was 200 years ago...hell, in a lot of unofficial ways its not what it was 20 years ago
In my experience most people realise that the monarchy has almost no real power and if they tried to exert what they do have against the majority they'd get rolled quick smart.
I think the Queen has done well in the past basically by saying that any of the commonwealth countries can decide for themselves if they would they should become a republic, shes not going to try and send in the troops, proverbial or real
If there was a referendum to become a republic then im not going to be out in the streets trying ti stop it but i like the Monachy, possibly not every individual person but the idea, I dont like the idea of removing connections to a troubled past, but learning from them, changing them
My experience ,baring as with most things extremes, is that most Maori don't all white people kicked out and to be rules by the Maori King, They want the fair bits of the treaty upheld and the unfair bits corrected. I have no Maori blood in me but i wear a greenstone pendant because i see Maori heritage as part of what made new zealand what it is, i think most people see that working both ways