One model I have in mind would be if it there was something in it for almost any company, then a company membership of say a few hundred bucks a year should work.
And what's in it for the companies / industry to make them want to join?
A voice that makes DOTARS / CASA / Ministers listen and take note and work with industry. I appreciate that this would be a bit of a chicken /egg thing - companies would only join if they saw results first.
On the other hand, the more immediate benefits for companies could be:
NPRM's deciphered and interpreted and made relevant for industry people. i.e. "Here's the NPRM, here's the way it will affect you, here are a few solutions / compromises. Which way do you want to push?"
Also industry assistance (as opposed to the regulator's "guidance material") in setting up schemes (SMS, DAMP to name two topical ones).
The idea is just an embryo at the moment, and any further ideas or input welcomed.