You know, this is just a thought, but I think instead of searching for a cishet YA author to lionize in place of JKR, people should simply support trans authors.
I also still think more people my age should be reading Grown-Up Books and not YA but that's not a fight I want to get into today, let's just start by reading more trans people instead of cis ones who say they like us
The main difference between Grown-Up Books and YA is largely less shying away from saying The Bad Words and focusing on literally any period of life other than your mid teens.