I really feel as though this is more the realm of the DM of the game that yo, specifically, are playing. Unless you happen to be said DM and are looking for thoughts on the matter, I don't know what we can really answer except what we would say as the DM.

That said, if you have some creative mage and a way to fake a soul in an illusion or some such, I can see such a ruse working in some circumstances.