Taking the proposal in my first post, and speaking from a position of not having seen a single line of the site code
it would be time-consuming rather than difficult. If you change from one title to two, and need to choose between them, that effects every single screen, sub-routine, print etc that uses title. Even if it's just to look and see if it has to be changed, you still need to check every occurrence. The bits that are to be altered are anything around input, edit (screen, Ninja, bulk edit) and display. Screen layouts have to be altered to accommodate the new field. All the google code needs to be altered to use the chosen title, and all invoicing etc must use the appropriate version. Space has to be found on screen for both the extra title and the choice box. All emails have to be checked to make sure they use the right version. Whatever duplicate checking they have needs to consider the implications of two titles - compare both? It's a massive amount of work. And when it's done, it all has to be tested. At least twice.
It always makes me cringe when certain folks on here say "it would be an easy change", as if they just need to wave a wand.