Hello Kenneth Borsch,
Thanks for reaching out to Microsoft Community.
We understand how important the keyboard is to your device.
We would like to inform you that Surface Book tablet and its base come as one, and its serial numbers are associated to each other. With that being said, it's not recommended to use another keyboard on your Surface device, and if you need a replacement, the entire device needs to be replaced.
Hope this clarifies your concern.
Kind regards,
StevenK