I have twice drafted a suggestion along those lines, and twice deleted it. The problem is that anything like that is confrontational, and could well make relations between the club management and the fans worse. Could also damage the relationship between the management and the Supporters' Trust, even if the ST wasn't involved (I am sure they would NOT be).
But, yes, a demo outside the ground before a game, or something inside before a game or at half-time - having tipped off the press beforehand - was what I was thinking of. If it's outside, talk to the police beforehand to make sure that it's legal and that you won't be done for obstruction or something like that.
But have such actions ever been successful in any way? I'm thinking about Man U here, and Newcastle. Dangerous, too - if the management has other things lined up, then they might just get up and leave, putting the club into a worse position than it is now.
Other than continuing to press for better communications, especially via the ST, I can't see a way forward.