GURPS Powers: Divine Favor

Again, pardon the necro, I've finally gotten a chance to use this book, building a DF Dungeon Saint who is also a con-man.

What would you say would be the Enhancement required to allow Charisma to give bonuses to the Petition Roll? Either equivalent to Religious Ranks bonuses or as a straight up +1/lvl bonus?

I was thinking Cosmic +200%, but to also allow the Charisma to sway any Indomitable people/monsters/gods the character might talk to.