Unless I'm mistaken, isn't the Shinra-Kotetsu's only major advantage tied directly to life fibers? Otherwise it doesn't seem to actually boost her that much aside from giving her clothes tendrils after absorbing the entire dead ancient life fiber.
I also mentioned that it can be a form similar to that one, perhaps even more powerful if anything. But yeah, I do realize that's the case, but regardless I could do either that or a new form thats semi-based on it. It'll need some thinking.