When I soldered up my cable my connections looked something like this.
Connections.png
As you can see, the wires coming from each cable are cut to different, but complementary, lengths so that the solder joints for the wires overlap with the ends of the resistor. I used heat shrink tubing over each solder joint and then a larger piece of heat shrink tubing over all 3 wires and the reisistor. Once it's all connected the resistor is pretty much inline with the rest of the wires, and it all collapses into a short, but somewhat stiff, bundle. It still looks a little like a snake that ate a rat, but it's better than a monkey fist in the middle of the cable.
If you're really good with spacial relations and a soldering iron, it is possible to solder the resistor between the tip and sleeve terminals inside the 1/8" stereo jack. But, I haven't tried that yet.
The only Android efforts I'm aware of are over on the ProChrono Bluetooth option thread.
Great, I appreciate the idea. I am very close with my soldering iron but as usual there are places I am forbidden to even try for, that sounds like one of them.