Curved RNP onto GLS is starting to sound like the solution...
Agree, but the technology is not mature enough to offer that as a solution just yet. Offset RNAV to ILS has/is being considered, but it too is a developing approach standard.
There are 2 main outstanding issues. The vertical guidance from a RNP/VNAV (ie baro) approach generally doesn't match up with a a geometric vertical path (ILS/GP). Second point, there needs to be a nav mode change from RNAV to ILS. It is proposed this nav change needs to occur at 3-5nm or 1000-1500ft. Feedback from airlines is that this too close to the stabilised approach gate and may cause problems.
I don't see any of this as show stoppers, but the methodology is in its infancy
Pretty sure Virgin is already approved RNP-AR approaches to RNP 0.3 minima
Correct