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So theoretically we at home could try changing JPs and re-loading the JCMs, if we export the morph and re-load it onto the figure after joint alterations?  I'm thinking about the neck, and whether there could be a way for me to use the new 125 joint morphs with my custom JPs.

Yes, if you have a morph loader that has a reverse deformation feature, you can do that. At the moment, as far as I know, that's either MorphLoaderPro for DAZ Studio, or colorcurvature's new tool, if you have access to it. You would export the mesh to an OBJ file as it bends with the original JCM applied, change the JPs, delete the old deltas and then reload the morph from your exported versions of the mesh.

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The plan looks good.  That's things yet-to-be-done, rather than a list of what to expect on the 126 figure, right?

Yes.

-- I'm not mad at you, just Westphalian.