I really do not think so. All textual evidence, as well as very clear statements by RJ, suggest that the Dark One is an entity which stands in complete antithesis to the Creator. He is a cosmic force, not a man. He is an entity very much reminiscent of the Manichean mythology, and if mythologies should be compared, he is really quite a lot more powerful than the Biblical Satan, as he seems to be the Creator's equal in all respects. Since he is not a man, or even part of the reality of the books, I highly doubt he has a soul to transmute. RJ said that Shai'tan is a force which is not human in any way. There is no reason to think that he has a body, or a soul. Note that in Shaidar Haran he could be said to have imprinted part of his essence on someone existing in reality. He also did something similar to Padan Fain at a very early stage. That being said, I think the Dark One's essence is to huge to be carried by a human, trolloc or myrddraal host, and nor do I think he would be able to move his essence into reality before the seals break. After they break, why should he bother with putting himself inside a human, in the highly unlikely case that it actually could be done? All in all, with Shaidar Haran he has succeeded in creating an agent directly controlled by himself inside the reality created by the Creator. When the seals finally break, he will widen the Bore to the point that he can finally break into reality completely. When that happens, he will be omnipotent, and able to do whatever he likes with it.
As a side note, given the mythological underpinnings of the work, and textual evidence, I believe it is self-evident that the Dark One is not, and has never been, imprisoned. I think he has been shut out. When the creator made reality - all the connected universes and dimensions, all the physical and non-physical worlds in the world of the books - he effectively made sure his dark antithesis would be unable to affect it, as he would surely attempt to destroy it. When the Bore was drilled, Shai'tan was allowed a way into reality. He is not trying to get out of a prison in order to be free, he is trying to gain access to (one of) the realit(ies) the Creator has made in order to destroy it. Ishamael is the only person who has really understood this, as indicated by the works he wrote in the AoL, and supported by the fact that he "called for the destruction of everything" when he revealed himself as Forsaken. This also explains the Creator's apparent lack of concern over the fact that the Dark One is breaking into reality. The Dark One is no threat to him, only to what he has made.