As you can see, the Archduke saw Mr Harvey's tweet, and answered it. I'm not sure who the dwarf kings under the mountains of Austria are, but I hope they will assist in the Restoration.
Immediately after Archduke Ferdinand replied, one of his cousins also replied. Archduke Eduard is the Hungarian Ambassador to the Holy See and to the Sovereign Military Order of Malta. I wish Mr Harvey had discovered their 'zecret maszter plan'! I would volunteer to help. Of course, Archduke Ferdinand's grandfather, HI&RH Otto, was Godfather to my youngest daughter, so I owe them service.