How did you save the transform of each bone? I don’t know about posable mesh. While simulating the physics body, you can right click on it and at the bottom “keep simulation changes”, then save the pose as an animation file. Then you can use the pose directly or create an animbp and “layered blend per bone” if you only want part of it.
As I’m only creating some decorative corpses, the animation asset alone with some additive editing would work.