The page you refer to (http://www.englishclub.com/grammar/verb ... e-time.htm
) simply lists a few examples of how different tenses can be used to talk about different times. It should not be taken as exhaustive.
However, I don't believe that the structure you propose ("If I had worked tomorrow, I could not have agreed") is possible. Even in my most fevered imagination I cannot conceive of a situation in which it could be used.