We should have an elected head of state and they should be King or Queen. This allows us to remain a 'kingdom' and enjoy the pagentry and history associated with it. If the person has family their kids become princes and princesses !
The current royal family stop having special rights and their titles/ position no longer recognized by the government. However, individuals have the choice to call them their queen/king if they want to. They just no longer have to.
The actual role of the head of state is for a different discussion. This is an idea for the mechanism.
Vote for this if you want to be King or Queen !
The United Kingdom. Where anyone can rise to be King.
It removes the cornerstone of the class and hereditory system and makes this country one that has opportunity for all.