I also like the idea of converting the story afterward. I'm not sure if you're already doing this, but it might be nice that, when the story wraps up, you let players choose to convert the final PDF into first, second, or third person.
Also tangentially related, but have a look at AI Dungeon it was a pretty early attempt to create an LLM-driven text adventure game.
Oh I remember AI Dungeon - I have played it myself :-)