Why would you even bother to do that? Just revoke the kingdom whenever the current king gives you a reason to do so. It is not as if a king of Taurica is dangerous.
Hahah why they create people with prince and princesses , So why revoke them , infact nowadays I holy war them !
Just so they can keep there title , so there heirs are all prince and princesses ..
Just have to watch it for those crazy adventurers and assassinate the king on time , before somebody else revokes it .