From what I have been told, K&N Designed the intake for the Demon and most likely are the OEM supplier of the filters. So I suspect they have an anti competition clause that needs to run out before they will offer a K&N Branded filter.
I have seen posted that if you just try a few of the on line parts warehouses that some will still get you the race filter without proof of Demon Ownership. Maybe most will shut you down but I have seen posted more than once about sucess.