@SenecaFalls I was under the impression that the DoE counts as same "level" as the queen so is the one person people (including blood princesses etc) would all curtsey too if he was at an event alone without her? Did I misunderstand that?
Surely Archie doesn't automatically become a prince. It's optional. Like the queen's other grandchildren, who are not considered princes or princesses, including Edward (ie even if blood princesses can't pass the prince/princess title, the blood princes can and Louisa and James ARE in fact grandchildren of a sitting monarch). But Edward (and I thought, Anne) chose not to. And Harry and Meghan chose the same. So that won't change when Charles becomes king.