The "simplest method" should work fine, it actually claims to be for the international model.
But unfortunately it was uploaded through a filesharing service and the link appears to be dead.
The format of the reginfo file shouldn't be any different on the respective K2 models.
You could create the file and copy it to the Kindle, then use USBNetwork or launchpad+myts (terminal emulator for K3, might work on the K2 as well???) to copy the file across.
No need to dive into the deep end immediately, by editing on-device using `vi`.
