Hi @Hazza,
My immediate thought was to wrap the post in a plastic mesh such as this Jack 50 x 50mm 1200mm x 10m Supa-Net and then zip tie it around the post at the bottom, middle and top of each section so it is held securely, but the in-between sections are loose enough for the wisteria to climb.
This method would mean there are no hard materials that will easily scratch the post and there is no damaging hardware such as screws that would leave holes in the post.
This is one possible solution.
Allow me to tag @Noyade, @Noelle and @mich1972 to see if they have any other ideas.
Jacob
