Getting Turn Undead On An Evil Archivist

[7th son of sons]

I am trying to find a way by which to get Turn Undead onto an Archivist. The usual stuff I can think of, Sacred Exorcist, Prestige Paladin, ETC are not available, because this Archivist is evil. I know Dread Necro and Cleric grants turn undead also, but I would prefer not to lose any caster levels. Any odd sources or out of the way classes to accomplish this?

[Jeff the Green]

Maybe Prestige Paladin of Tyranny/Slaughter? Other than that, I can't come up with anything that doesn't cost you caster levels.

Edit:
Except those would require rebuking to begin with.

[Inevitability]

Be an Unseelie Fey with Verdant Touch?