I would recommend keeping Australia as its own civ, including New Zealand. It would be good to keep Canada too, but if it had to go to make up space, surely it would make more sense to give it to the US than to Britain. I suppose that Malaysia can be put together with Indonesia (don't forget to give Singapore to China or Taiwan!), but you're going to need at least another civ to represent Thailand, Vietnam, and all those countries. If necessary you could always give Taiwan to China, which would be culturally appropriate even if not politically.
You really need more in Africa. I would remove Peru, at least, to free up some room here; you could also give South Korea to Japan if you had to. You should have at least South Africa, Zimbabwe, and Nigeria (which has 20% of the entire population of the continent) in addition to the ones you already have. Egypt would be good too, and Ethiopia if there were any spare slots left.