Just wanted to report that coleen c's recommended Philmore Right Angle plug was exactly what I needed. Once the plug arrived, I purchased a small "Motor Trend" 3-in-1 cigarette outlet unit at my local auto store, cut the cord down to ~6" and fed it into the plug (requires some simple soldering). My biggest problem was the size of the wires running from the outlet, just at the upper limit for the angle plug, but I got them to fit.

Now my chargers are out of sight and I have both cup holders back again! Thanks to everyone for their ideas.