Revisting quest to convert a 3D sketch to DXF or DWG

I'm simplifying an earlier question. Any suggestions on an efficient (or not) way to get a 3D sketch into a 3D DXF or 3D DWG format? I realize I can't get there just with SolidWorks alone. I have had success in converting solid bodies into a 3D dwg/dxf wireframe state, but what I really want for this unusual application is just the 3D sketch.

SolidworksImport export