Look on the internet to see if maya can do a "Hiddenline" veiwport shading. If so render the scene as normal, then take a screenshot from the same camera in Hiddenline mode, (this hides the backfacing wires) then composite them together again, overlay should get you going, but have a fiddle. Thats all I do to do wireframe renders in Houdini, or if I want a wireframe render of a meshsmoothed object as an isoline object.
EDIT: This is a Houdini tutorial, but this is exactly the method I am talking about
http://www.sidefx.com/images/stories...ame_render.mov