My local dealer won't do it unless the Stage Audio stuff is installed. According to reports at the "other" audio forum, Biketronics has developed a flash box that will do the Ultra 4/0 flash. Flash box can be rented with deposit (unsure if it requires additional purchase though).
The Biketronics one does not work on the 2019's according to my conversation with them yesterday. I was trying to get a feel for what kind of response I could potentially get from a dealer.
2019 Silver Flux/Black Fuse FLTRU