It is indeed a good and proper idea to sue the Vatican for the Jewish property and holy items it is holding, a form of aggravated robbery attended initially, we know, but myriad counts of aggravated assault and worse.
There should be lawyers, not only Jews, to sue for this crime against humanity, history, memory and holy items of an entire people by a global corporation that keeps bodies and souls enthralled.
People of the media 'profile' of Dershowitz and his friend Harvey Silverglate and so many others should prepare a proper plaintiff's motion, a class action on behalf of the entire Jewish people and State of Israel for the immediate return, with interest of the Temple treasures and ALL OTHER Jewish property held in Vatican City and in all other Catholic churches of any kind in Europe and any part of the world.
Then the matter of whether Israel will recognize the existence of the Vatican can be discussed by the entire Jewish people with reference to Moshe and the Rambam, particularly with reference to Hilchot Avodat Kokhavim in Mishne...
Prof. Eugene Narrett