Converting toposurfaces for export to DWG

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Hi all,
I've modeled a number of TopographySurfaces in my Revit model, and applied a different material to each so I they can be easily distinguished by color. I'd like to export views of my model as a DWG, but have run into the unfortunate problem that, because surface patterns can't be applied to toposurfaces for export, all of my color coding schemes are lost in the resulting DWG. I wrote an add-in to add filled regions over the toposurfaces as a workaround, but this can't be applied to my 3D views. I also wrote an add-in to convert the toposurfaces to meshed masses on export, but now struggle to make the triangulated lines of the masses invisible (so the geometry appears smooth). This leads to two questions:
1.) What's the preferred way to have TopoSurfaces retain their visual material properties when exported to DWG, especially using the API?
2.) Is there a viable workaround to (1) through clever modification of Mass visibility settings?
Any advice or pointers here are appreciated. Thanks!