you won't get the wire to show up in the render, you need to use the images form the playblast and overlay them on the render. I use nuke but aftereffects will do or even photoshop if you're just doing a single frame. Use a plus merge and the black will disappear leaving the render with the viewport wire over the top.

If you can't get it no bother i'll record a short video will have to wait till the morrow though as it's midnight here atm.

Dave