There is not a truly clean solution yet (it is a long standing wish though) but in the meantime you can get close by tweaking the DWG translator. The trick is to put the separator lines on a separate layer (see illustration) this way the consultants can hide or purge the other wall layers and be left with the stud outlines. Some firms I know do this themselves in AutoCAD so they don't have to count on their consultants' expertise etc.
For this to work properly it is best to restrict your composites to three layers (or two in the case of furring walls) consisting of one for the core structure and one for each of the skin assemblies.