I think it is a good idea.
Use wood posts, with a steel cap on the bottom and a short steel bolt
This makes it adjustable so you can load the columns as much as needed
now and in the future, and protects the wood from moisture related
rot. I saw these all over Germany, and thought they looked strange at
first, then realized how practical they are. They look funny because
you see a 6x6 post then a couple inches of 1 inch steel bolt on the
bottom, but they're plenty strong.