That seems like the way to go honestly. Just be careful to back up your books too because just one mistake can be enough to screw you over. I have a friend who ran into that very problem. Enabled wifi just one time without thinking and all his books were deleted. There were a ton of posts about it https://old.reddit.com/r/kindle/comments/18csl9d/all_books_g...

No idea if they ever fixed that or not. My friend had to try to track down which books were even on the device and then re-obtain what he could.