Arrrh but Fathom, the same situation applies. Use the closest DME for all profiles. And besides, 15 has a glideslope.
But back to the thread: we should have stuck with MLS and Multi Mode Receivers. These famous curved wiffodill Cat 1 GPS Approaches are many moons off, despite the rhetoric.
And I happen to like Monitored Approaches. Why would you, in crap conditions, let the right hand seater try to put it on the ground? I'm not saying mandate it, but it should be a round in the magazine, regardless of the visibility.