I propose, to steal Peter's wording, that we ditch the CHA shrine overboard and install a bright, shiny INT shrine. INT shrines have HD capability, a higher resolution, and furthermore, we only have two remaining CHA-based casters.
Favored Souls only use CHA for spell points and accessing spell levels; as long as they have 19 at cap, they can cast any spell in their book. They use WIS for spell DC, which is the important part.
As of now, we have 3 Artificers, probably along the same build plans mostly, and at least 4 active Wizards. All of these use INT for casting DCs. In Phydaux's case, it's also his Reflex save.
So all in all, I think the guild as a whole will benefit more from an INT Shrine than CHA. Of course, when/if we hit 55 and Peter uses his lottery winnings to purchase the next bigger ship
, we can easily fit in both. Even a DEX Shrine, for the two AAs we have. But that's not now, and I think the Wizards and Artificers who are building up in the guild have more playtime than a capped Sorcerer who only runs two raids, and a Bard who never runs at all.