Matt,
The links you posted show the way to do it, and it works real well. I have been using that process for a while now. I have found that AC Pro no matter which version doesn't like to import dxf/dwg data exported from Rhino. It doesn't matter if it's 3D or 2D line work. I use the work around of getting the 2D vectors into AC, by exporting them from Rhino as an .ai file (Illustrator) you don't have to have illistrator to do this. Just select the 2D>go to File> export selected, and a save window will appear, then just select the file type, name it and your all set.
CJH