On an entirely unrelated note, I am curious to know what your plans are for India? Because I can imagine that a Falangist Britain will be far more oppressive towards India than Britain was IOTL, which might radicalise the Indian Independence Movement towards violence.
For that matter, what is going to happen to Asia in general? I can imagine that China will likely find itself closely allied to Germany (and by extension the ASU) against a Falangist Russia, Britain and Japan. They may even sent weapons and funding over the Himalayas towards pro-independence Indian paramilitary groups.
I can imagine that with India, similar to what happened to Greece IOTL, we will see rival resistance groups forming. For example, we might end up with one group aligned to the INC that is heavily socialist-leaning and receives funding mainly from the ASU, and other groups aligned to sectarian organisations such as the Hindu Mahasabha, Muslim League and the Princely States that are more anti-socialist and are funded by Germany and China in an attempt to check American influence in the region.
We may even (heaven forbid) see a civil war between these rival groups that could serve as an analogue for OTL's Chinese Civil War, in that it effectively kick-starts TTL's Cold War between the ASU and its socialist allies on the one hand and the anti-socialist German and Chinese Empire's on the other. The Princely states would likely divide among sectarian lines, with Muslim states such as Hyderabad going to the Muslim League (you could even do what
@Aj chahal did in
his timeline and have Nizam Mukarram Jah of Hyderabad attempt to resurrect the Mughal Empire with support from the Muslim League) and Hindu states such as Gwalior backing the Hindu Mahasabha (who may likewise attempt to resurrect the Maratha Empire).
Which side would win such a civil war is hard to say (though I personally would lean towards the INC, both due to my own biases and because I think that the sectarian tension between the Muslim League and the Hindu Mahasabha would likely lead to them spending at least as much time fighting one another as they do fighting the INC).
An anti-INC victory would likely lead to a Partition that is even more violent than OTL, followed by violently theocratic and xenophobic rule on both sides. What is certain, though, is that following both what I assume would be a vicious guerrilla war against Britain followed by an equally vicious civil war, India would likely emerge devastated and traumatised, taking many years to fully recover.