Bypass Single SignOn (SSO) for certain SharePoint 2013 group

I have Single SignOn (SSO) enabled in my SharePoint2013 webapplication. For certain SP2013 groups (administrators) , i need to show a customloginpage , as an additional level of authentication.

Is there any way , i can render my customloginpage for certain SP2013 groups , even though SSO is enabled (i.e : For certain groups , it should show customlogin page when hit my webapp URL). Once the custom login is success , it redirects to my webapp homepage.

 

For other groups , it should redierct to my webapp directly , rather than custom loginpage.