True, Eric, some can. [the accent] but it is usually rather perfunctory. Not specific. Now, Wallis was an an American from Baltimore, of course, and had a distinct accent of her own. It came from her schooling and her affectations. She worked at it, so to speak, not natural.
You are quite correct, we are just speculating. This project is just being talked about. It is not even in pre-production stages. However, if it does go into production, I would hope it does justice to the people involved- Wallis, David, etc. I may not be a big fan of the Windsors, but I do appreciate a job well done, especially in films about history.