To be honest, I think this feature - disabling loaded and working customizations when entering /admin - is misguided.
If all you want to do is save yourself from boneheaded hosting customers, by all means add a site setting that turns all the links and buttons into the admin interface into real links that reload the entire page without any customizations and enable that setting by default for your hosted Discourse instances
Just leave those of us who can find a clue without immediately yelling at their paid support alone; please?