Minthara has Vow of Enmity, so Oath of Vengeance may be a wasted vote. As this ability is one of the Oath of Vengeance's Channel Divinity options.
Minthara also use Hold Person which is only available to Vengeance. But she mostly span Soul Branding which I'm pretty sure is an Absolute cultist spell and I wonder if we can learn those if we join.
If the subclass isn't available, I expect mods unlocking it really fast after release.