Somebody over at Trekmovie.com
has put forward a theory that surprisingly might work...
In Star Trek (2009) Kirk watches what we all assume is the Enterprise being built on the ground. What if, instead, it was actually Robert April's being dismantled and broken up?
That allows a starship to remain constructed in space at a dry or space dock facility. But establishes they are brought down to a planet surface to scrap down for their component parts.
The NCC-1701 registry number being carried over from one ship to another, still presents a problem however. Especially if you consider starship numbers to progressively get larger as time goes by and the Constitution as 17 (or 18) models away from the NX class. The commissioning of April's Enterprise wouldn't be long after the destruction of USS Kelvin NCC-0514. However that class of ship could always have been a few decades old in 2233.
You can solve the registry issue by having the ship refitted on Earth. So it was always the same ship, so no need to change the number.
Kirk's line in the comic about getting the new Enterprise can still work, if the refit was extensive enough. Decker claimed the Enterprise to be new in TMP, so why not here?
This will also explain how the Enterprise was (allegedly) built so much later in the new timeline, yet still ended up with the same registry number, instead of a much higher figure.