I want to chance the topic a little and wondered if you could add a "Coalition" point to your list.
What I mean is ANZAC combined with the Netherlands.
I do not know if someone agrees with me but it would even be "somewhat" historical accurate if ANZAC and Netherlands formed their own coalition. After all Netherlands did have colonies in southeast Asia and did stuff, like trade, or influence in wars, with Indonesia, Australia and New Zealand. The coalition could be called like "Dutch East Indies" or in this matter of case " Dutch East - Coalition" or simply "Dutch-ANZAC Coalition".
On the gaming level it would also benefit both decks since there are some points where they add up to each other.
For example their inf deck would get more complex and tank-wise it would also benefit the whole coalition. From Scorpion to Leo 1 and finally Leo 2 would give them some strength and mobility. (ANZAC will greatly profit in support and helicopter tab.)
Like Commonwealth itself it would also be a coalition which would span ("literally") around the world.
Please think about this, if this is not a good idea, pls let me know - if this idea is ok, then I am glad I could provide some ideas.