My dad just called me to tell me about the search you were doing, so I thought I would share with you what I have learned about Acadian history.
I have some pages photocopied from the ships passenger lists of those Acadians who were returned directly to France...
Jean Baptiste, son of Rene, died at sea along with 4 children. Jean's brothers, Rene and Ambroise are listed with their familes. However there is no mention of either Rene or Henri in any ships listing that I was able to locate.
Keep in mind that, by this time, Rene and Henri would have been in their mid to late 50's. Speculations are endless as to what may have happened to them: they may have been fighting and taken prisoner to be shipped to England; possibly died during the time that the family moved from Acadia to Ile St. John; possibly died in the fighting to be buried in an unmarked grave. The biggest difficulty to overcome is the fact that a lot of church records were destroyed by the English when they took over. Mind you, I'm not saying that it is impossible to find, just that it is unlikely that such a record would exist. If no one has tried the "prisoner of England" angle, that might be the next avenue to start down.
One other note: you have listed that Rene Guillot and Marguerite Doiron had a daughter, Marie Joseph. This is incorrect. Rene and Marguerite only had the three sons: Jean-Baptiste, born 1721; Rene, born 1726; Ambroise, born 1728. The only Marie Joseph listed among the family is the daughter of Jean-Baptiste, born in 1750, which was the year that the families went to Ile St. John as refuges.
I hope this has given you a bit more info to work from. If I can be of anymore help, feel free to e-mail me: email@example.com
Nancy Colette (Guillot) Rowland