I think there's enough hype and love around this that a demo isn't really necessary, especially if it would be a majority of the game. If anything, depending on how part 2 is set up, you could do a little between-the-games that starts as a precursor to this one; similar to Late Night Talks. I know that means more work on your end, when you're already crunching time to work on this game, so understand if that wouldn't be feasible. Just a thought!
I'm patiently waiting and will happily wait until 2024 - I truly love this world and these characters very much. They're worth waiting for. <3 Thank you for the update!! Make sure to practice self care and rest when you need.