Restricting Admin-ship on user-created subdomain

Hi! As an additional source of restrictions, I want my users to enter their newly-created subdomains as a lesser role than Admin. I understand this may be a contradiction of logic, as admins can't create or destroy Subdomains, which is precisely what they would be given the ability to do. I just don't want them having the ability to modify anything, except for what is specifically allotted them.

Any code-fu available? I can't seem to find an applicable plugin. This will be utilized in addition to Pro Sites. Thank you!