Hotspot login tied to remote dansguardian proxy?

Just a thought. Is it possible to setup one hotspot user group so that when they log in, they are tranparently proxied and the next proxy up the way is a proxy like Squid or Dansguardian?
This way a login could be tied to a ‘safe’ proxy, while another login is directly routed without proxy. Any thoughts or suggestions? I’d like to turn off cookies in the hotspot to force logins all the time. Then parents would use one login, while when gone, kids could use the safe login when parents are gone.

All thoughts, suggestions appreciated!
Thank you,
Marshall