Here's a Python script which will flip or mirror a morph across a body part.  You'd want to select the option to "flip" the morph, and it's best to run the script on a zeroed figure.

(This is the same script I posted in the main Antonia thread.)

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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.