That's probably really late to implement something like this into the server, but better late than never.
As the title says, what if this server rather used the system that was present on the Lawn, giving the verified role manually to active and well-behaving members, as opposed to being automatically given upon meeting a certain amount of messages? I'm not sure whether it is possible technically, but those members that hit certain amount of messages could be given kind of "on check" role and then reviewed.
Though, I can totally see why it would not work as it might be too much job to the mods and also make some users wait for too long. Still, I want to hear what do you think on that.