I created an auto updater that allows you to add tables, delete tables, copy tables, add table columns, or delete table columns especially for remote customers. This will not merge data in tables, but it does help when you have to make some design changes and don't have direct access to the backend database to make those changes.
You can download it here:
And the documentation is here:
Be sure to open it with your SHIFT key down as it is designed to update automatically upon opening, do it's updates, and then close.