Well, for a Feet Wet campaign you only have a limited amount of Refresh to work with, but I might do something like this:
Bless This House (-1)
Guide My Hand (-1)
Sword of the Temple (-3)
The Sword of the Temple grants Sponsored Magic: Soulfire (with the Item of Power drawback), and also counts as all the Item Slots this power grants (say, +1 Offensive Spirit Control, +1 Defensive Spirit Control, +1 Warding, and counts as a Warden's Sword as well). It can only be wielded by those with the True Believer template. Important skills for this combo: Conviction, Discipline, Weapons, Lore (which must be Good or higher for the above version to be technically allowed).
While the Sword costs the same as a Sword of the Cross, it feels completely different, mainly serving as a (very potent) mystical tool, as opposed to a weapon in and of itself. Though you can certainly use it as a weapon in emergencies...
It also fits the Knight Templar thematics. They were always associated as much with magic as faith and with potent relics as well. I like the idea the more I think of it, and may build a character for some game built around it...