I've never really understood where all these savings would come from if we looked at NCO pilots.
If it were run similarly to current NCA, then a new Sergeant earns as much on starting as a top-tier level 10 Fg Off, and costs you over than £10k more than a similarly-aged A/Plt Off or £7k more than a Plt Off. Sure, they're capped at a lower level, but even your top-level Sgt only saves you a few thousand a year over a Flt Lt.
Starting them as Corporals means you'd be saving a not-very-spectacular £2000-odd a year over a Fg Off.
Besides, if you didn't up flying pay to cover the gap, wouldn't all your new NCO pilots being paid less than their officer equivalents be even more likely to PVR their way to airline jobs as soon as they had a bunch of hours under their belts?