Is the Anima gents different from the ancient practice in which most ancient rulers, including those of the three books (just to squelch the idea that some regional beliefs are better than others)?

But reasonably speaking as previously mentioned, if done tastefully and carefully enough to prevent any unappreciated exposure to those particularly sensitive folks I don't think you should have that hard of a time running it. You'd just have to make the story about something other than the "romance."