Often in a dictionary, an "alternate" spelling has an entry pointing you to the correct spelling. Perhaps something like this could be applied to titles - go ahead and retitle, but keep the old one and use it as a pointer to the new one.
In general, though, I think your suggestion would be a disservice to the people you're wanting to help. Sure, we might be able to protect them from their naive mistakes by keeping the naive titles, but in the real world outside the Monastery, they'll still be running into this problem. All we'd have done is reinforced their naivete, not helped them to learn how the big boys work.