'Current airline pilots' is a fairly restrictive criteria. It excludes any pilot who my be retired, resting or out of work. Of course it also excludes others whose input could/would be invaluable.
Since most of us in aviation have a licence of some category or another, expired or not, and the information you might be seeking to provide would be of significant benefit to us, then what about a subscription fee and a scanned copy of the paperwork?
It might take you a little time to vet everyone but a one page licence copy would surely take you a very short time to approve or reject?
I think that most professional bodies have a subscription fee of some sort or another, at least those to which I belong do, and since that, in essence might be what you are trying to establish, then why not?
Good luck with an excellent idea anyway.
Anyway, you know from reading these, your own pages, how many out there have a clue about matters aeronautical!