Was just about to suggest some sort of 'anonymous suggestion box' scheme myself. For maximum inclusiveness you'd probably have have it on the club website and/or via a dedicated email address though, which obviously opens it up to abuse from numpties from other clubs, but hopefully not enough that you couldn't screen them out.
Much as I like the moderated Q&A idea as well, I can see the club being on a hiding to nothing with that one-- assuming they can only answer a limited number of the questions submitted at any time, and they get to choose which ones, there would doubtless still be a paranoid element moaning about favouritism, grudges, cover-ups etc.