Actually the next release will allow exports with TC superimposed in the image. Currently you e.g. can add a Tc overlay in Compressor, or create a TC overlay clip for use with Media100 exports in AE or Red (render it out with alpha once and overlay it in a V track).
I have a DVD recorder that I use for client approval purposes. They're relatively cheap these days. I use the analogue signal looped through my CRT monitor to feed the recorder, and then just play the timeline with the TC displayed. The audio is from an output on my Mackie mixer. The picture quality is obviously not as good as it could be, but for client approval purposes it works for me... quick and easy.