How's that restricting ? It's all clans need no need to be creative You wanna be creative give them titles I did that for my own benefit to understand your idea
All they need to do is remove admin except for owner. Then replace the admin box with a pop up list that allows you to choose what they do, such as; kick members, accept members, start ebs, forfeit eb, change title, etc. This would probably be much easier to implicate and would keep use of titles still. So many level titles would be a waste because there is already a custom title