I'm game for that
Reminds me a bit of the alternate universe setting for Justice League: Shogun of Steel graphic novel which was also set in feudal Japan. Batman's role in that was filled by a female ninja and they fought Brainiac, I thought it was well done and had always hoped they'd do another one since it was a one off book. Worth the read if you're a fan of samurai stuff and it'll be interesting to see what they do with the Batman Ninja movie/series?