The 3.19.x dislikes specific values in the fake user entry; I used to set all fields to empty string and that gives you the scary popup. It's still possible to fake registrations with proper values, there are some posts about it which I'm too lazy to find right now. Only problem with that method is that the reader crashes if you go into Settings -> Accounts while WLAN is active.
My reader is currently registered properly, it's safer that way - you never know what they decide to change in their next update.
In the future, if Kobo makes the registration checkings even stricter, the only viable method for faking it might be a patch of some kind.
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