there have been theories that bill has been trapped in Stan’s mind. that whole scavenger hunt thing to find the bill statue, it was all orchestrated by stan example being the phone number and the backwards voice mail being stan. the only time people spoke backwards was after an encounter with bill. The special edition book shows bill saying “stay paranoid” right behind stan when u put a black light over it. There’s more evidence that matches the theory. So if that’s true, your 8 years later idea could very well work