Aterpster
Speaking only for "N" registered airplanes, the FAA requires that database and FMS vendors not include RNP AR IAPs in the database unless the operator and aircraft are RNP AR qualified. The procedures have to go through a second validation including "flyability" for each type of FMS before the RNP ARs can be added to the FMS database. Again, this is a straight forward process for air carriers, but not so for business aviation.
Curious, the Honeywell FMS DB on the Global Express had a variety of clearly RNAV AR (RNP) approaches loaded for KASE despite no Globals were, at the time, approved for AR approaches. Handy for daylight VMC Roaring Fork Visuals, though