They can be combined -let a powerful catholic nation (or the papacy) have an event (at 1550 or whatever deathdate chosen) that kills them, then let most majors have an event that triggers after pope-event if they are catholics when they get to decide upon dismantling the order (+ 1 tax in two provinces, -1 stab, +2 RR for 12 months and 200 cash) or incorporating the order (+1 aristo, +1 quality, + 5000 cavalry, -50 relations with pope)