A 24 fret conversion neck will have a longer fretboard over-hang than the regular 25.5" 24 fret necks. The 7/8 neck is actually a better design because it has shorter overhang and improved access to upper frets.
Rather than a new conversion neck, IMO it would be better to offer new 7/8 body styles such as VIP or Velocity.
If Warmoth are going to offer a new neck design, I would like to see a 7/8 24 Fret neck in scale length of 25.0" or 25 1/8".