Ah, then it exists! What you describe is, effectively, what I mean.

It sounds like the script you mention does more or less the same thing I want, all in the Poser side. Assuming it works on a mac, I could use this immediately.

(long description follows)

For me, clothes. But I imagine that it would be anywhere you wanted to create morphs in Blender that cross actor boundaries. You have to have a "uni-mesh" for sculpt in Blender to work (you don't need it for vert editing, so long as you're careful in the selection of verts.)

Example: A simple leotard for La Femme

The mesh is symmetric, which makes it easier since I wrote a script that mirrors all the JCMs on one side to the other

For this one, a lot of weight map work had to be done at the legs as the movement of close fitting cloth mesh is very different than the HR cloth donor mesh when the openings are right at a joint like the thigh/hip)

A manual looked something like this:

In Poser:

• Pose the figure and it's conformed clothing
• Export as OBJ (without welding, keeping bend and JCMs mesh effects)

In Blender:

• Import the OBJ (keeping vert order).
• Copy the Object
• Weld the new Object into a "uni-mesh"
• Create a map between original Object and welded new Object: new_mesh.vert <-> [old_mesh.vert...]
• Sculpt the uni-mesh
• Use the map to apply the uni-mesh back onto the original mesh, diffing.
• Export the changed original Object back as an OBJ (keeping morph targets)

In Poser

• Load Full Body Morph
• If this is to replace a JCM, delete the old, name this as the old.

Obviously scripting on the Poser side makes this easier, even with "uni-mesh-ification" being in Blender.

First, the Poser script can export the entire series of poses necessary for all the JCMs, as a stack of OBJs.

Second, It can rewrite the all the JCMs on import of a stack of OBJs. Either creating new or editing existing. Combined with the mirror JCMs script, it could create the other side's JCMs.

Part of the reason I thought "Blender script" for "uni-mesh-ification" is that this has utility outside of Poser. There are times where I have multiple meshes/objects and I want to sculpt them together, while keeping them as different meshes. I want common vertices "glued" together, for sculpting.

Sorry for the length of that :)