If your lens is a Xenar 135mm f/3.8 it's a lens for the "Standard-Press", a press-camera with a fixed back and image-circle isn't an issue with press photography.
Both Schneider's Symmar (convertible) and Rodenstock's older Sironar have more or less the same image-circle. In both cases the movement of your T III is the limiting factor not the lenses' image-circle.
You can look for a new or used Copal #1 and exchange it yourself with the Compur CIX . But the f-stop scale isn't exchangable. So why not a CLA for your old shutter? As you can see
here it's better to clean a Compur as to exchange it with a Copal.
Peter
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