Shutdown to prompt password

Hi All,

I am looking for a way to prompt for password when I shut the android down.

I have a casing which I have tweaked to make the battery removal almost difficult. I also have some security tool that can alarm my phone when it goes missing.

Now I need to make shutdown difficult.

If someone takes my phone, they will not be able to remove my casing unless they pry it open, i have a lock at the main screen.. but they can press the shutdown button to go to flight mode, shut it down.

Any ideas pls ? Any tools would be great.
Thanks