Diamond are based at Gamston. There are a number of instructors based there who have become very familiar with their products. It would be ridiculously easy to use this pool to offer difference training. As far as the avionics are concerned, there are a number of training aids available which allow any owner to master the things which could get him into trouble in a very small number of hours.
I do not know about other aircraft owners, but when I buy an aircraft I read every word I can find on the thing before I get into it for real. I think this is not a big problem
Rod1