Now, as you read this suggestion, bear in mind that I know nothing about .deb files, apt, or other binary package whatsits. To me, a Linux package is a .tar.gz file, and package management is configure, make, and rm. That said, modest harnesses some sort of magic to display a version history upon completing its installation. Could you not use similar magic to display necessary instructions for your clock?

People will click "OK" without reading the instructions, of course, but that's a separate issue.