I wouldn't despute it might work peter. Along with talking at the pilot constantly through the approach which some seem to favour.
We could also have a ratchet tightener on it to stop any tendencys to pitch forward in the flare.
But I think I will stick to thinking a nicely flown NDB hold and approach is the mark of a competent instrument pilot who I would have no reservations against putting my signature against stating that fact as long as they don't screw up the rest of the trip. With the certain knowlege that if its the same but a VOR it will be easier, and a radar vectors to ILS will be even easier.
Anyway I am off to do 2 NDB approaches in a manual aircraft with the GPS positioned well outside my instrument scan and shock horror no radar coverage. I have survived the last 6 months doing them so you don't need to worry.