My proposal (for head of State) is that somebody chooses the first King or Queen, who shall reign for up to six months, any point in which the King or Queen shall name a successor and abdicate. Not democratic, but the Head of State shall be largely ceremonial.
We could always have the GM handle the monarchy & royal family. That, in some respects, could be more fun than picking and choosing for 6 month 'terms' monarchs, allowing for dynastic struggles, family feuds, a more 'natural' method of rule.