Torsion Rod Adjuster Stuck

Just forget about that cotter pin, hammer the socket on and the nut will cut it clean off, no worries.

As for me I also would just torch the T-bar, then remove all the parts and replace as required. I've done that a few times. Tip#683: coat the replacement threaded areas with anti-seize. You'll be able to come back in ten years and drive the adjuster up with all the weight still on the tires. Wipe it off exposed areas after final adjustment, so it doesn't hold dirt and moisture.
But I've also driven the T-bar out using the pin as Oldmanmopar details.