I'm going to give it a try on my 950 ADV when I get my new front rim. (1.6") I'll be sure to report back.
This setup should be similar to a sportbike tubeless setup in a flat situation.
The reply I got back from the owner is they may plan to do wider version too.
2.5"x 18" seamed possable for the SE rear. 4.25" he's not so sure.
2.1" for stock front maybe in the future.
I'm sure the more people that contact him showing interest in differant sizes the sooner they may be made.