I completely agree with FDXpilot. I believe the intent of the policy is that you deviate on the first leg, and not the second. When the window pops up telling you that both segment will be cancelled and you must rebook the second segment, you click the continue button and the origin to destination ticket you want that includes the original second segment. That is what you told the company you would do.

The real way to settle this would be to contact contract enforcement and ask them how this works. After you get the explanation, ask them to publish it in Positive Rate to explain it to all of us. If you can indeed deviate on all of your legs and then later change your mind and rebook on a scheduled segment and be protected, that is something we should all know. If they aren't willing to publish that, then they aren't sure that is the intent.