Bit of an update: I finally figured out how to deb-ify my script! Now you can install it via a .deb package.

I also applied to be able to upload to extras-devel, so hopefully in a couple of days it will be up there, for your easy-update pleasure.

Edit:
Gees, this stuff's complicated. I got access to Extras-Devel, but now I need a .changes file, and apparently I can't upload the .deb file I made using this howto...