I'm thinking Heim-joints would need to be sealed from the elements to survive.
Perhaps something with a simple and cheap (stock'ish) greasable ball joint mounted/bolted into the front subframe crossmember could be fabbed up with a sleeve&lock nut on the balljoint and remaining strutrod.
The ball in the joint can rotate so there would be no need for reverse threads I think.
Open up the hole in the k frame, weld a ball joint sleeve to the k frame, thread in an upper ball joint, shorten and thread the end of the strut rod, use a threaded sleeve between the strut and the ball joint. You now have a solidly mounted, fully articulated strut rod. Prepare for road noise.
