Australian actress Natasha Liu Bordizzo would be a good addition to the film. She was in Netflix shows Crouching Tiger, Hidden Dragon: Sword of Destiny and The Society. She also had supporting roles in films The Greatest Showman and Hotel Mumbai.
Liu Bordizzo she has a black-black belt in taekwondo and training in Kenpō karate.
I could see Liu Bodizzo playing Shang's sister Zheng Bao Yu or love interest/partner Leiko Wu.