If it is not already there, do a sticky for new members explaining it and show and tell on when they change ribbons and designations. When I joined, it didn't take long to figure it out on my own. Don't know what odd size means, but they worked OK for a long time, so it can't be too much of a problem.
I hate to argue about it since it is your site. ...but you did ask...
Right now you have the supporter icon next to your name, do you like the icon itself with a different word on it?