Thanks for the plates, I just looked at the public procedures.
I really dont see anything unusual that this could not be published as public, especially if many airlines are already using it. With a single turn to final, it could simply be RNP, not RNP-AR...
One thing that would really help, would be speed restrictions on the waypoints to keep the RNP traffic moving, rather than going to idle descent, and potentially being a roadblock.
Not clear why the FAA does this.
https://www.youtube.com/watch?v=Xd8IvorFvWo