That is what you should actually do to join Dominicans and Benedictines too. From what I understand this is more like being a patron for the orders or like an oblate (a member of the order who has not taken the vows of obedience, poverty and chastity).That would not be fun, tool-tip would say something like: "By joining Franciscan order you abdicate as a ruler and give away all your wealth to the poor." Like suicide, but your heir does not inherit any money.
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