Sorry Tudor but the Journos already know about CHIRP and it often IS tomorrow's sensational headline!
On a more serious note, I too am a controller and I'd be keen to participate in such discussions. We must remember that aviation is a system - as clearly shown by many of the reports in CHIRP which cross professional boundaries.
My first thought was that maybe those who are eligible to recieve CHIRP in the post should be eligible to participate - but that, of course, is largely limited to UK licence holders. The benefit of the forum that you suggest is that it would have global input which would hugely increase its value. And I would strongly advocate that it is not an open forum so that there is less risk of honest professional debate being misinterpreted (whether in all good faith or maliciously).
I don't know what the answer to how to validate access rights - perhaps a combination of you moderators reviewing a short questionnaire of pertinent info plus a few quid to register for those that have the credentials would do the job.
But the idea gets my support.