I see Roger's point. What I don't see is what the real issue is. Re saw the bottom of the post, if it needs it, use a hand pull saw. Is the post attached to the lower beam via a tenon? Why is it out of plumb in the first place? Can it simply be driven over with a big hammer? If it has a tenon, try cutting the mortice longer and drive it over to plumb. I can keep going with more questions but as Roger points out, imaginative speculation. This begs the question what kind of contractor and engineering people are working on this project?