I have had luck with using a long bar, 5 or 6 foot, prying down on the drag link as close as you can to the pitman arm. At the same time, hit the pitman arm from the side, while it is up against the limit of movement. I mean hit it, hard, with a Big F'ing Hammer. Have a friend hold the tension on the bar, if you can find a friend.
Heating the end of the pitman arm prior to prying and beating helps.
Some may take a lot of attitude adjustment, but I've never met one more stubborn than me. They will come apart.
Oh, cutting the bolt won't necessarily help, but will remove leverage you can use to help pry from.
In your picture with the pickle fork, I don't see any flattened spots on the outside off the pitman arm, which there will be if you are hitting it hard enough with a BFH