My own logon page

Is there a configurable way to just plugin my own Logon page.  What I really
want to know is: say I want to secure my Model with
SecurableStandardLogEnabledModel.  If a user of my site tries to access this
model, I want to direct them to a logon page if they aren't logged in.  Right
now it will just redirect them to Keels default "access is denied" page that
has a link to Keel's logon page.  Is there any easy way to override this
behavior to direct users to my logon page?  

Thank you, 
Nathan