I think I see where you're stuck. There should be no need to do you work over again, just the import/export-fu within Poser will need to be done with a different order/settings. Follow these steps exactly and you should see the desired results:

Starting with an empty scene,

(1) Import "blMilWom_v3.obj" from "runtime:geometries:DAZPeople". Make sure everything is unchecked in the import options dialog.

(2) Either choose "Object:Load Morph Target" from the menu or use the button on the object properties panel. Choose the zBrush-modified OBJ.

(3) Set the new morph target to 1.000, and then choose the Grouping Tool. Hit the Spawn Props button. Delete only "blMilWom_v3.obj". DO NOT delete any of the loose body part props (unless they are completely unaffected by the morph).

(4) Load V3 into the scene and disable IK, then open the Joint Editor and hit "Zero Figure".

(5) Select the BODY. Run the python script, and then name the new morph whatever you want. Hit Move Morphs, and you're done :)

I just did the above, so I know it works. The only thing I did differently than you is used the new Blender sculpting tool on a groupless V3, rather than zBrush.