Actually, NCC-1712 belongs to the Bonhomme Richard, schematics of which do exist: http://www.shipschematics.net/startrek/images/federation/heavycruiser_bonhommerichrd.jpg.
I think that the Bonhomme Richard is important enough to the point that she not be contradicted in this version of the timeline. There would be a version of the Bonhomme Richard, only she like the Enterprise would be different.
I would do one of two things: go with Proxima, but also go with the registry given to her in the Star Fleet Technical Manuel, which is, as I listed: NCC-1737. Given that she belonged to the Achernar sub-class, which was a slightly improved version of the Constitution class, this would make some sense that the Proxima also belongs to a sort of uprated version in this version of the timeline as well. I too like the name Proxima, so I would just go with that, as well as her original registry, to refer to the original timeline.
Or you could make this the Bonhomme Richard of the AU. This too could make sense, since the Bonhomme Richard was another sub-class of the Constitution, basically an improved version of the Constitution class.
I think that the Bonhomme Richard is important enough to the point that she not be contradicted in this version of the timeline. There would be a version of the Bonhomme Richard, only she like the Enterprise would be different.
I would do one of two things: go with Proxima, but also go with the registry given to her in the Star Fleet Technical Manuel, which is, as I listed: NCC-1737. Given that she belonged to the Achernar sub-class, which was a slightly improved version of the Constitution class, this would make some sense that the Proxima also belongs to a sort of uprated version in this version of the timeline as well. I too like the name Proxima, so I would just go with that, as well as her original registry, to refer to the original timeline.
Or you could make this the Bonhomme Richard of the AU. This too could make sense, since the Bonhomme Richard was another sub-class of the Constitution, basically an improved version of the Constitution class.