As things stand, he is and will reign as a member of the House of Windsor. This doesn’t, however, negate the fact that the Prince of Wales is a member of the Glücksburg branch of the House of Oldenburg.
Before the Queen’s declaration of the house name, the house name never had to be declared and was taken as a matter of fact to be the patrilineal name; usually a name of the most recent patrilineal ancestor of agnatically related royals.
The Prince of Wales does not have a surname. The surnames Windsor and Mountbatten-Windsor are reserved for male-line descendants of Queens Victoria and Elizabeth II, respectively, who do not hold the title/style of prince and Royal Highness.
When the Prince of Wales becomes king, he can make the house name whatever he wants... but he cannot negate the fact that he is also a member of the houses of Oldenburg and Glücksburg. This does not mean that the genealogical head of those houses (the titular Duke of Schleswig-Holstein) has jurisdiction over British dynastic matters.
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