If court is like EURome has it, even wills and factions will not be needed as the Court can act like a Regency Council with the Chancellor or Spymaster as its head. And the preferred heir mechanic to take care of the faction spliting.
Well if the late King was at odds with his chancellor or his wife etc. by making a will he could bypass them in case that a regent needs to be appointed... Or if he trusts noone he could appoint a regency council with his wife in its head or the local Bishop...