This post has scripts you can use to install fake registration on a Paperwhite, although it may or may not be enough to fool a Scribe:
https://www.mobileread.com/forums/sh...&postcount=125
Once you install the fake registration, you should probably keep Wi-Fi off permanently, since you can't do anything with Amazon's servers without a real registration. The script attempts to block access to the registration server, but Amazon could have made firmware changes in the last three years that would prevent this from working.