The condition of the car merited an access panel...
After seeing the condition of the floor/tunnel, I'm ready for a Southwest donor!!
Here's what I found and hope this helps for anyone else having a problem. Unfortunately I don't have pics...
From the small access panel (see previous thread for location--front of the shifter), I found where the cable comes out of the tubing. Then, I bought a 3/16" rod, cut about 4-5" in length, and tapped it into the tube (thus tapping the plastic sheath out the engine side). Then I was able to remove the tube!
My struggle wasn't over, however--I noticed that the tube was kinked in a certain location (probably why my cable was sticking?). I tried running the new tube through but was unsuccessful--there was a dead stop. I took the old cable and located the general area of where the stop was--I could see it just rear of where the defrost lever was (I took this out to look). It was rusted and I could see pinpoints and noticed that the tube had rusted so bad it was warped!
From underneath the car, I cut (dremel) another small ACCESS PANEL
through the rusty floor, surgically removed the segment of rusted tube, and ran the new cable through. I used some hose/clamps to seal of the rest of the tube.
I'm back in business. I feel like I just performed some sort of cardiac bypass surgery...
Note: I realize the underbelly of my teener is shot, and I apologize for cutting 2 small windows for those purists out there... Perhaps you'll all forgive me....