Migrating Signal to a new Note 8

I recently purchased a Galaxy Note 8 to replace my aging Note II, and am in the process of migrating data. Most items are relatively trivial to move over, but Signal Private Messenger tries to be secure enough that it ends up being impossible to migrate non-text content with standard methods – images, voice, and group chats are not transferred.

After some investigation and several ADB versioning issues, I have successfully tested a workaround for migrating Signal data between Android devices.