Americans, who think la Marseillaise and the tricolour represent France, tend to forget that it was the royal victim of the revolutionaries who was the best foreign friend of the new American republic.
Critical point to be made. My second question was answered in your post, which is that the real Rite of the Holy Roman Church will be used. Appropriate.
Otherwise, as was said in the eastern part of the dual monarchy, Eljen a Habsburg kiralysag! Eljen a monarchia! Eljen o fenseg, Otto von Habsburg!