To be fair the project had already gone through 4 years of prototyping by the time it was cancelled and was very close to a trial production run of the missile. So while it’s not something that could be done in two weeks, it was very close to completion before being cancelled.
Given that multiple other JP projects have actually mentioned using the seeker developed for JNAAM as a base (including the AAM-6). Along with information existing about some things developed for it (TRM modules having separated transmitter components, allowing for more cost efficient repairs). I do think the seeker at least was completed or very near completion.
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METEOR uses an initial rocket motor and then cruises on the “ramjet” (also solid rocket, technically. Just without oxidiser.). I reckon it’ll accelerate alright.