It has been many years since I've tried that trick with the Wire material. And it seems that it no longer works. You are right, no matter what I try the object renders as wireframe.
There was a trick I saw many years ago where someone made a JPG that was white with a narrow black perimeter. Then they added a UVW Map to all the objects and set the Mapping to Face. This essentially mapped that jpg to each individual face, giving the appearance of black edges on a white object. The downside of that method is the edge thickness varies greatly depending on the size of the face.
Here's another option. Render your model using your base color. Then make a Standard material set to Wire, apply it to your objects, and render again, saving with the Alpha channel (PNG, TIF, etc.). Then composite the wire pass over the base pass in an image editing software.
Chris Medeck
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