I don’t think it could be possible to truly change the Intent of a shard, it’d be more plausible to have the name and perception of the Intent change from not only others, but the shard themselves. Even if he could make people think that the intent of his shard is not Odium, but Passion, or Envy (In which I believe might be its own individual Shard, but that’s a crackpot theory with no eveidence), I think he’d still be Odium at heart, but only showing that hate for mankind in the case of Envy, and in the case of Passion, hate and any things relating to the subject of Odium, can be considered very strong emotions which relates to Passion, which is feeling emotions strongly, if this is not the case, it would make it easier for him to make choices of his own, and considering if Passion could become his Intent as he says it is, it would make Rayse an even more scary thing than he already is to say the least. So, I do not think the Intent of a shard could actually change, but I do think how people perceive the shard and what they call it could change. Though, many things in the Cosmere, mainly in the Congnitive Realm and possibly the Spiritual Realm, belief can change things, whether this could effect a shard, I’m not educated enough to say and someone should probably tell me if this even could be possible.