The law already exists to allow the NEG to stop traffic under the Community Safety Accreditation Scheme. This just requires the relevant Chief Constable to delegate the power over to people who aren't police officers once they complete training and demonstrate competence. It already works among the 4 Welsh police forces and, I believe, Essex. The stumbling point appears to be a reluctance from other forces to do the same and I think the main issues are that they aren't prepared to accept the approval of the Chief Constable of another force (meaning NEG riders would have to get approved in each force area they want to operate in) and a general reluctance to delegate powers to civilians.
Interesting, Could British Cycling not just become the employer for all English regions? After all they are running a campaign to keep racing on the roads and the NEG is a major factor in doing that going forward IMHO.
I'll possibly be seeing you at the race I'm promoting on 5 May if you get allocated to it.