OK, been thinking about this one a little...here is an idea...just try to follow me here...this is some "for real" outside the box thinking!
Get a piece of some plastic that is "stiff-ish", but flexible...I'm thinking some sort of empty plastic food container...or drink bottle, around 4-5" in diameter. Poke a Sooteater rod sized hole in the top and bottom, offset clear to one side. Now cut about 1/4 to 1/3 of the whole side, top to bottom out (opposite the SE rod hole) including some of the top and bottom, in a fashion to make a "scoop". Think of it like this, put your hand straight out with your fingers slightly curved, like you were going to dig a hole in the sand by hand...that is kinda the shape I'm thinking of. Now stick the SE rod through the previously made holes and duct tape your "scoop", or "hook tool" to the rod...use plenty of tape...no need for anything else to come apart in there!
Now, what I am thinking is that if you stick this in there while turning "against" the direction of your scoop (or "backwards") you should be able to add rods until you get up to the end of the hung up tool. Now start turning it the other direction, so that your tool can possibly scoop up the stuck SE rod off the wall of the liner...assuming it is stuck at the 22.5* elbow, this scooping action, along with gravity, maybe enough to get it to drop down within reach.
A bore scope could help too...but I'd try this first, even without one.
Hope this makes sense...if not, I can make one and take a pic...