Reply to Message

You might use the F4 (repeat) key as part of this. And/or check lists of shortcut keys. Maybe you can find a key combination to move you to the previous or following section. And a shortcut key to uncheck link to previous. The goal would be to use a quick combination of keys to move through sections one by one. And in each section hit the shortcut to unlink. (Or F4.) Or the below link might make it even simpler.

http://www.makeuseof.com/tag/set-custom-shortcut-keys-ms-word-cheat-sheet/