New York City they are setting up these approaches for the Wall Street and East 34th Street helipads.
these helo plates are already available...
NYWallStChart
PinS are entirely possible for aircraft, and there are quite a few... floatplanes, 737-200 with gravel kits, seasonal runways. The oil/gas industry is a frequent user.
It is a way to design a procedure to a non-cert runway, or one that is not in a nav database.
PADU...you make sure you dont go missed there....