@mailman123,
Well, once again we have Gretchen's very definite opinion: Personal identity is body identity.
"So, no matter how many duplicate brains Dr. Matthews creates, the only person who will be identical with the original patient is the one who has the patient’s original body. [...] Gretchen asks, why should she care any more about her brain’s survival than her body’s?"
If the "unfamiliarity" is any indication, the excerpt at the bottom from
Who Am I? suggests that the new Fortinbras body is not a clone of Dennett's original body Hamlet, the latter now long since deteriorated (he even considers it wise not to pry about its "history", which suggests all the more it is somebody else's former body). Even if it was a clone, the bit of new information supplied above was that Gretchen is fixated on the belief that the original body has to be involved.
The original body isn't the one that Yorick and Hubert are sharing in turns, so it's likely that she would not accept the situation as being the original Dennett, regardless of whether the original brain or the computer version was controlling it. That is, if the tale could be submitted to Gretchen, this confusion over which one is controlling Fortinbras during a given period would seem to be irrelevant to her (she sounds very obstinate). Your project is odd from the standpoint that it's slightly more about literature (exploring a fictional character's motives or "What would Gretchen do?") than the philosophical issue of identity.
"He [...] assured me that steps were being taken to re-embody me. [...] when I awoke, it was to find myself fully restored to my senses. When I looked into the mirror, though, I was a bit startled to see an unfamiliar face. Bearded and a bit heavier, bearing no doubt a family resemblance to my former face, and with the same look of spritely intelligence and resolute character, but definitely a new face. Further self-explorations of an intimate nature left me no doubt that this was a new body, and the project director confirmed my conclusions. He did not volunteer any information on the past history of my new body and I decided (wisely, I think in retrospect) not to pry."