Maybe I'm blind, but I just don't see the importance of restoring these upstart eastern european monarchies.
In the Lord of the Rings Pippin Took asked Gandalf if the Steward of Gondor was the king? Gandalf replied that in some countries the steward might eventually become king, but not in Gondor, even if 100 generations might pass. The line of kings in Gondor was immeasurably sacred.
England and her monarchy could be compared to that of Gondor, as could that of Russia, and that of Austria. The Royal Family of Savoy and Sardinia (later kings of Italy) could also be said to have this longstanding, sacred position. However, the monarchies of Romania and Bulgaria have no standing except as minor branches of German royalty. If there is to be a monarchy in either of these countries it needs to be raised up from the people of these nations themselves.
My father is German, and I deeply love the royal family- revere the memory of Kaiser Wilhelm. However, I don't think that there is any legitimate reason to restore the Hohenzollerns to a country in which they are entirely foreigners.