What originaly raised this question was the fact that the NSFA VOR/DME (both units) have gone u/s. Now the NDB in Apia is not available to bring you onto the ILS so the NZ Airways has issued an alternate approach using a GPS arc which mirrors the VOR/DME arc.
However this is obviously only available for GPS equipped aircraft, so my thinking was why cant an arc be published using the ILS/DME.
I guess it would need to be resurveyed but if so is it a viable option.
The other option would be for all non GPS operators to only use the NDB teardrop approach and live with the high minimas.