GUE does not do any crossover instructor training. All GUE instructors must follow the GUE certification and instructor training process. GUE's curriculum can differ significantly from that used by other agencies and thus does not allow for effective "crossover" instruction. This policy does not differ based on the type or level of instructor you are or wish to become.
The full outline of GUE instructor development can be found in the GUE Standards document. A more detailed explanation can be found in Quest 16.2, in Dr. Panos Alexakos's article Becoming an Entry Level GUE Instructor: the Two Signature Process. Of course, if you have any questions don't hesitate to contact email@example.com or a GUE Instructor Trainer or Evaluator.