Honestly, just straight up disabling old saves would be fine with me. "THIS SAVE IS FOR A PREVIOUS VERSION. PLEASE START A NEW SAVE" in big letters on black background. Oh, and that "FOR FURTHER PROBLEMS CHECK OUT THE HELP FOLDER OF THIS GAME"-screen that A Zombie's Life has.
If someone figures out a way to cheat-finish the Otherworld storyline, that would be great too.
Would people still come here to ask questions? Of course, but it would hopefully reduce it somewhat, or if nothing else make our rage even more righteous.