Might I suggest that the current A4 concom approach the clubs (which are all still going strong) and ask them to be involved? Every year for the past few years they have been doing their own minicons, but to be honest they really did feel like they were shut out by previous committees, so one can see why they have no interest in approaching the Natcon/Worldcon committees to submit manpower and ideas.

Have media fans actively participated in the universal natcon committees and submitted ideas and panelists for programme that were rejected?
Yes.