I set this up a few months ago as an experiment. Worked pretty well until I discovered that for iMessage to work, the application phones home to Apple using your hardware IDs, and this project uses fake values. At that point I started spiraling down the Great Waterslide of Nope, slowly discovering that the fake values are flagged by Apple and they will, as a consequence, flag your iCloud ID as a potential spammer, limiting your access from other devices. Your only option is to use a hardware ID generator script they vaguely link out to, and you can just keep trying values until you find one that "works", but there's not actually a good signal that you found one that works and isn't harming your iCloud reputation.

Worked really great otherwise, though. Very useful in a pinch.