I think the supposed advantage of XP2 is that you can also print traditionally, so you can get that hand-made fibre print as well as scanning it easily. I never found it quite lived up to the "best of both worlds" idea and abandoned it a few years ago in favour of traditional emulsions. It can look nice but still has that "desturated" look to it, that digitalesque smoothness.
So, if you're only planning to scan why not just desaturate colour? Isn't that effectively what XP2 is, colour film with the colours missing?
Mark
(Turning into a bit of a silver purist)