Been here done this.
Get a chromoly post.
Driving a rod down the post, filling the post with epoxy, welding re-inforcing plates on, etc.
All any of it does is move the weak point. The gen II posts were just weak.
I decided to go cheap and not worry about it. when my steering post snapped off the sled took out an 8" tree. So I saved a hundred bucks up front so I could spend 800 dollars in parts later to put it back together.
Just bite the bullet and get a chromoly post.
I went with a Wildchild post and never had another problem. Sold my sled with 6,000 mountain miles, 5000 of those with wildchild's post.