find a way to integrate Aweber, Mailchimp for user site

Is there any way to allow my user sites to build their own lists using their own autoresponder such as Aweber or Mailchimp? I tried the WPMU Mailchimp plugin, but that is only for the super admin’s list building.

I think it would have to be a plugin because I don’t want the subsite user to be able to insert the html and form’s embedded code directly.

I know I can manually (as the super admin) insert the form code for them, but I’m looking for an automated method.

Thanks, Joe.