Same method I used in my TD app.
OSC FTW!
At the end of the day, our monitor rig (which sends LTC) has a clock display with the time remaining on the track (Pro Tools) and we made each LTC clip the same duration as the video track (most common used case for most acts), so we just had monitor world send the clock data to the stage since it was already positioned on stage left.
Who is needing to see the time remaining for your shows?
You might email Resolume about SMPTE over OSC