There are tricks that can, some considerably, help but they don't take a bad shooter to a great shooter. They are generally for taking a good shooter to better shooter and I'll take a shooter with the worst form in the world that shoots a lot over a shooter with perfect form that goes to the range a few times a year.
In other words find whatever works for you and practice, practice, practice. I've seen some great off hand shots that have never had professional help or even read a book or article for that matter. It seems that the OP is generally talking about off hand in the field and for that these "official" stances described and shown are a pretty much a waste of time.
Good field shooting requires tossing the bench out the window and learning trigger control, breathing, etc by sending lead down range. Holding your feet and elbow at the perfect angle isn't very feasible out there.