Quote "Looking at one of the WD poses, I see that the Hip actor has keyframed translations.  This may mean that the "in place" Hip translations are present in the poses, in which case an alternate set of Antonia WD files might help."

You may be right, in which case there is more hope!

Quote "Where real problems would come up is when a walk path is applied, I suspect.  That's pretty definitely hard-coded, so we'd need a Python script, there."

I doubt that the path would cause any major problems. It is the BODY translations that follow the path, not the hip.