Hey Dina,
I did some further research, and while reading the Tv tropes page for the Cinder Spires, I came across something interesting.
"Aurora" is the name of the Roman goddess of dawn. Furthmore, Ciriaco is a given name in both Italy as well as Spain.
So Spire Aurora may not be faux-Spain. It may be faux-Italy/Rome? The British vs. Spainards angle might be more appropriate to the Victorian themes, but the naming schemes of Aurora being a Roman goddess and soldiers bearing Italian names may point in a different direction entirely. This is a made up world, after all, and not all parallels need to be maintained.
Also, as someone who's entire family spanning back generations is 100% Sicilian, and I can tell you I don't personally take offense if Ciriaco is essentially faux-Italian, or if the Italian government of Spire Aurora is thought of as corrupt by the people they're being attacked by.
(Also Quantus, that action figure is amazing. I want one, and I'm not even from the South)