Experts on fonts would probably immediately tell us that an O would have to be wider than the onscreen digit 0. Then again, there are more fonts out there than there are typewriters even today; we really couldn't say anything definite about fictional 23rd century fonts.
Certainly a TAS-style descriptive letter would be pretty cool, at least to my perverted mind. It would also be consistent with the onscreen appearances of three-digit registries, none of which have had the preceding zero so far. And as said, I'd love to continue believing in NCC-514, USS Rahman
, in addition to believing in this new old ship.
I wonder if we will learn the class of the Kelvin
in the movie? That'd be a first, really...