Is there a way to add a TC Window AFTER rendering to MPEG2 to avoid re-rendering another MPEG2 when the TC no longer needs to display? Perhaps in DVDA2?

To clarify, what I'm hoping to do is send the client a review DVD with Timecode Window Burn. Then, if no changes are needed, simply burn another DVD but without Timecode without having to re-render an MPEG2 file.