No one was saying that you should follow a story exactly. That wouldn't be very interesting imo, even if it was possible.

I feel like the most interesting way to do it would be to have it very explicitly in an alternate timeline. You could do this by killing a main character, or by otherwise having a major divergence. Then it feels less like just stealing ideas and more like a "What If?" story, and would help nip the urge to follow the story too closely.

I seem to recall a podcast or comic or something that was this but in a Star Wars universe, that opened with Luke Skywalker dying and the podcast/comic characters taking over for him. I tried to look it up but I can't find anything about it now. Wish I'd remembered the name.