I am looking for a way to organize my themes for multi-site users

I am looking for a way to organize my themes for multi-site users. I have created a ton of child themes for various themes and what I would like to do is put all the related sibling themes in the same folder. So for example, I would have a Twenty Twelve Folder with 10 different sub folders and those sub folders would be the children themes. Is this possible or do you know of a plugin? I also use Pro Sites so being able to regulate it by levels would also be a plus. Thank you!