Confucius was a supporter of the monarchic system as it was in China. Aristotle was leery of republics and democracy. De Maistre was in favor if traditional European monarchies.
My desiderata are adjusted to the existing and the possible. We cannot restore the dynasty of Macedon or of the house of Lu, so we are left with the existing House of Bourbon, which moreover has a reigning monarch. I think the three old fellows could have agreed with the practical considerations of this choice.
Oh look, it's raining monarchs. Louis Alphonse de Bourbon isn't on the throne in Spain, or anywhere else for that matter.