It does work as an Allied force pretty well I think. Stick to the proven units. Grab Celestine for the HQ, Battle Sisters to fill the Troops slot (really, they do it well. Still among the best Troops in the game). The units that really make it worth it are a squad of Seraphim as Celestine's bodyguard, and maybe an Exorcist because it's nearly always useful.So do you think they'll be a good ally force then?