First of all, do you know for a fact that Jeffries actually built the Constellation? That seems to be the crux of your argument. Because if he didn't and, say, some production flunky did, then there probably would have been no rationale at all for the registry number. And if Jeffries saw the model and had any problem whatsoever with the number, the decal could have been removed and another one added in its place.
I don't see why anyone would have had any problem with the registry just as it was seen on screen.