No worries, I'll do something in the next day or so.
I don't have Geo Control, but does it output an .obj mesh like World Machine? If it does, upload a mesh (8km x 8km if possible and resolution of 512, and with it's terragen .ter file) and I'll put an option in to load that format into the Maya script.
Edit: Never mind, there's a trial version of GeoControl available.