From what you've said it does rather sound as though (without getting all conspiracy theory about it) that the people who've set up the 'Friends' aren't particularly friendly to the site at all. Sounds like you care very deeply though. The objections have to be in soon? Do they have to come from an organised group or can anyone produce them? If the latter, can you club together with some like-minded people and do something in time?
Perhaps you shouldn't be worrying about upsetting these people. It does sound rather odd when you say one of them makes a living out of beautifying quarried holes. Do bodies like EH have any interest in what's about to happen?
what do you think you'll do?