I think there is a big misconception regarding flight training from unlicensed airfields. Take the example of a gliding club or micro club, which is conducting flight training anyway. Many of these are unlicensed, have full planning permission and have been doing flight training for many years. The micro club could add a VLA version of its existing 3 axis training fleet and start doing the “GA” PPL alongside its existing micro NPPL. The number of sites, which could choose to do this, is quite large. The extra cost of doing this is just the cost of the aircraft and maybe an extra qualification for the existing instructors.
Rod1