The way I see it (which I recommend you take with a grain of salt as it doesn't necessarily have direct evidence in cannon) is that when the Black Court Vamp kills, it consumes the soul. When the body rises, it is only physically the same person with shadows of memories, etc (the brain is intact and reanimated as well). Thus, it's not an enchantment (and couldn't even be undone by the Fairy Mothers).
So, to turn a BCV back, I can think of one way: re-create the soul. Not impossible, but very, very difficult and likely to not be taken well by various powers (including the capital G). Also, likely to not go 100% correctly.
If the Vamp is significantly old enough (more than a few days of decomposition), you'd have to re-create the body too.