I think the JCMs are the greater hurdle, in any conforming clothing for Antonia.  But if the polygon structure doesn't permit body part divisions which are similar enough to the Antonia base, rigging itself might be the greater problem.  If the polygon "flow" (that's "topology", right?) differs too greatly in the worst "crunch" zones for joints (front of thighs, say), that might interfere with the effectiveness of the rigging and make the JCMs more difficult.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.