This is impressive, and you've done an amazing job in giving a well detailed explanation of each of the keys and their functions.
You did well in guiding us on how to see our trustee account too, I would have love id you included screnshot to guide others would can read your post and want to try it out.
On the aspect of what to do when active key is expose, you've done well in saying one must be fast enough to do the needful on time by changing our keys before the person send out our liquid assets..
You're trustee account don't have anything to do in this situation, because to can still access your account, it's in a situation when you'd owners key get expose that you need your trustee account to help you out.