I know people who have multiple job titles and multiple sets of business cards to match. They claim that this allows them to fluidly assume different roles when speaking to different people.
The head of the Anglican Church is one of these multi-title jobs. If I had that job, I would want at least two sets of cards. The first would say, "Archbishop of Canterbury" because I think that title commands a lot of respect. The second would say, "Primate of All England," because I think there’s a very different, very interesting, and and potentially very useful, effect that this title could exert as well.