No.
The only way would be to create a totally separate non-inheriting group with each access you want to give that group individually.
That being said, your description is confusing.
Why do you have donator admins if they don't get donator perks.
Also, forums, at least this one, doesn't have separate group access either.
Though there are 'titles' that various people earn, this doesn't change the group permissions they have.
Perhaps you could find a title/tag, or even team name if playing on a non-gamemode(Sandbox) server, addon that you could rename some of your titles for players.
