I think this is really creative! I’m wondering about the timeline issues however.
Bae was about 14 when he came to our world for the second time and stayed here (we think). This was about in 1991. In the episode Tallahassee, we see his birth date was 1977. If he came here at the age of 14 and claimed to have been born in 1977, then he came here in 1991, a few years after the Curse. He met Emma in 2001 when he was about 24, making him 34 now. If Bae had gone back to the EF at any point, he would have started aging again and thus would be a lot older. Also, how did he escape from Neverland?
I do hope we get more Arthurian legend in our show but it might be best to save until after adventures in NL to prevent it from becoming too complex.