I believe that most Air Cadet regional HQs have an XO that is a full time employee and a Wg Cdr OC that is the VR(T) officer that seems to work well.
What you say is true of
Wing HQs
Leon (of which there are 35/36). The Wg XO is a Sqn Ldr.
Regional HQs have a full time Gp Capt - FTRS or MSF - (JM was one such before 2 FTS) and a full time Sqn Ldr. All the HQs have also 1 or 2 CS Admin support.
The vast majority of Wg XOs are ex-regular - I know of at least one ex gp capt and one ex wg cdr - both GD. Each VGS is allocated to a Wg HQ for admin purposes.
One of the problems in the past was that 27 VGSs sometimes did things in 27 different ways. That is just one of the things that 2FTS has changed for the better.