I was thinking about spell-caster detouring in other careers. What do you think about instituting a Wizard/Priest Rank rule like the Noble rank rule? Basically your spell casting rank is made by counting up careers with Wizard or Priest in them (or whatever). Any rules that reference Character Rank are changed to reference Wizard/Priest rank.
I think if I did this I would also rule that characters can not buy spells or blessings unless their current career is a wizard/priest one.