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With a POD after 1900, have a Dominion of India (i.e. the current monarch in London is also the monarch of India) survive until 2000. This Dominion should include at least Delhi, Bombay (Mumbai) and Madras (Chennai) and larger/much larger is just fine.
Ideally, Canada, Australia and New Zealand should have the same relationship with the British Monarch as India. And if you can pull off an Imperial parliament, that is great, but good luck with the question of whether New Zealand and India get the same votes or not.