There shouldn't be any trouble with inserting ERC into a figure as long as that ERC points to that same figure.  I've done this when I've had my odd problem with a cr2 losing all of the ERC from the JCM's, applying the full channels section of the un-broken cr2 as a pose.  The ERC is correctly inserted and all is well.

I could see complications if you were to try to add ERC to a conformer's JCM's, which should be activated by the posing of the conforming parent figure.  In that case, you'd need to apply a pose specially-tailored for the conforming parent's figure number.  If you had to do that, I'd advise bringing Python into it, but I gather you're working on trying to integrate clothing into the main figure with geom swaps, rather than work with conformers.

Aww, I don't deserve any credit for anything.  Just so's I can get a copy of the final product, along with everyone else!  :D  I can't wait.  I stumbled upon an old build of Brad in my libraries the other day.  It looks like you've made amazing progress since then.  :thumbupboth:  :woot:

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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.