My father was in the air force as a mechanic during WW2, and was stationed in India. He flew 'over the hump' into China, to deliver supplies. He used to tell me the story of coming across a very small and poor group of Chinese Jews. To help, he would take army blankets to them, and they would make amazingly nice clothes and sell them. I can't remember a lot from his stories. These Jewish people looked Chinese, and that they still had an ancient Torah and/or some other Hebrew things, but actually practiced more like Buddhism.
About 8 years ago, I met a Moody Professor of OT and Hebrew. In the conversation, I mentioned the story about my father. He said, it was thought that the KaiFeng Jews had disappeared before that, but based on my description, they could only have been the KaiFeng Jews that my father met. We were both excited but unfortunately, my father had passed away so there is no more information I can get.