That sounds like it'll require access to the phone number to set it up on a new device, and that's assuming the user promptly has the funds for a new device

Even if it works for desktop clients also, that still needs to be set up using a data matrix scanned by the mobile device (or if that's already done before you lost the origin device, you can "simply" extract the faux-encrypted sqlite format that the desktop client uses, albeit with having to recompile this encryption extension for Sqlite manually — ask me how I know..)