I can’t give you any textbook references or anything, but I can share a family story, and if it’s in line with what you are looking for, I can help you get more information from my motherinlaw. (I think this is a good story, what I know of it. I haven’t confirmed historical info, I am just quoting the story as I know it)
My motherinlaw is half-Japanese. Her father was Taiwanese, and went to Tokyo to train as a doctor during the (whatever the technical term is for the “occupation”). He met a Japanese woman there, and got married. While he is was in Japan, the Japanese went to war with China. As a citizen of a territory of Japan living in Japan, he did not have to go to war. They had three daughters, and then moved back to Taiwan. His wife had to give up Japanese citizenship. As a citizen of a territory living in that territory, the young husband and father was sent to war very soon after arriving in Taiwan. He went out on a warship that is now known to have been bombed before it reached China. He was missing in action for many years (and in fact his wife denied any chance of his death until at least 15 years later.) For some reason, the wife could not go back to Japan. Also, her children were Taiwanese. So, she stayed in Taiwan and raised three half-Japanese girls by herself. She could not speak Taiwanese or Mandarin. She did learn some Taiwanese over time, and always was indignant when anyone laughed at her Taiwanese accent. Apparently, if they had troubles with the neighbors, she would be sent to complain about it or sort it out, as the neighbors accepted her as the odd foreigner. (I find this funny as this is my role in the family today )
According to my MIL, they lived in a community that had “many” half-Japanese children. My MIL and her sisters were the only ones that learned to speak Japanese fluently after the Japanese left Taiwan, as other mothers felt pressure to keep their kids more Taiwanese. My MIL’s mother learned all the traditions of Taiwan and made sure her children took part in celebrations like the Moon Festival and Chinese New Year. I found it quite interesting that there was one neighborhood boy who grew up to be a little “odd”, and that my MIL and her friends put that down to the fact that his mom never tried to fit in with the local culture and celebrations.
If you do decide to get some personal stories and have specific questions, I am happy to chat with my MIL about this and pass on any information. Just let me know.