IO, could one not "design" ones own GPS approach for an airport?
Even easier, and what the FAA did yonks ago was create "Overlay" approaches. In other words they said "Here's an old NDB/VOR approach into XYZ, we realise that NDB's are ****e, and GPS is far mor accurate and so now you can officially fly it using GPS as primary reference". The Approach plate is labled something like "VOR or GPS RWY 30".
Of course anyone with an IFR certified GPS and any sense of self preservation will activate the XYZ NDB approach on the GPS and fly it using the GPS, possibly backing it up with the ADF, even in Euroland.
Beagle is correct of course, Anchors are useful, and wanqueering might even be fun of the right person does it, EASA are neither useful nor fun
