Cayeux in France listed ensata at the bottom of their page but I didn't see it in the catalog, just pseudos and their hybrids. Too bad, there are a number of growers/breeders in my neck of the woods, Lee Walker and Chad Harris come to mind.
If you can contact these people they may be able to help you. Long time breeders usually have a lot of connections, especially since they may want to get new plant material to work with to enhance their hybridizing programs.
If it is OK with you I can move this post to the Iris Forum where you should get more input.
I used to grow a lot of Japanese irises and dabbled a bit in breeding; had a pretty nice collection at one time. I still have a few of my favorites.
