The UK is under some form of attack at the moment (probably mostly internally generated - no need to invoke bogeymen). We have seen quite a lot of anti racist activity recently and it is likely the nasty lot have been contained (hopefully).
The Commonwealth is always welcome here - that's why our mutual Queen (EIIR) created it. She got to grips with us proles rather well from around 1995 onwards when the Royal Family realised they have to engage with us lot.
Personally speaking, I've always thought of AU and NZ (SA etc) as mates. We might disagree about a few things and rugby and cricket and that. However we have more in common than not.
I have no doubt that the mood in AU and NZ is largely stirred with anti British sentiment (we see it here from Scotland, even though "modern Britain" was invented by a Scottish king - James 1 or VI).
NZ have often moved towards a silver fern on black flag. I say: why not - if that is your idea of your identity then crack on (it does look rather cool). Also, perhaps AU should rethink their flag - you go all in on gold and green. Ditch the blue thingie with the southern cross and the union flag in the top left - it doesn't suit you. ... or keep it because you can and proudly do whatever floats your boat. AU needs to sit down and take a really hard look at its flag and do what is best for AU.
The world is a messy place but let's keep it civil (and real).