A 3.5mm audio cable was sacrificed today and soldered directly to the aux out connector on the tablet. This worked perfectly, L & R audio + ground soldered to pads big enough for a beginner with an iron (or big enough that an old, worn out soldering iron like mine could easily accomplish the task).

Next step is to install the aftermarket cd player and start testing the tablet aux out/cd aux in. Unfortunately the stock screws holding the factory cd changer in place were over tightened and made of a very soft metal. Most of these screws were stripped and will need to be drilled.