I think you’re gonna need more than just a clever twist to make this appear original. Kinda feels like “Kill Bill” with a dude. But it’s like I’ve said before it’s hard to tell from an idea what the final story will be like even if you’re the guy writing it.
Also you’ve only referred to it as a story. What form of story is it going to be? A full length film, a short film, a novel, a short story, one big paragraph?
You are right… Screw the Kill Bill references. Keep the katana and the twist. Let’s revive an even more dead genre than kung fu movies: detectiv-movies. A Charlie Chan for the 21th cencury. With samurai swords. And a blues playing japanece man. And explotions.