I made a mistake. The NCC-1707 source for the Intrepid is not Franz Joseph (he used NCC-1708).
NCC-1707 comes from the FASA Ship Recognition Manual published in 1985.
This demonstrates how Paramount was officially eclipsing (or nullifying) Joseph's work by the time Star Trek IV was produced in 1986.
Ah, thanks for that. I didn't even bother to crack my FJ tech manual, but I just did, and it is indeed 1708 in there.
In any case, the point that it doesn't match any number given in "Court Martial" stands.