This is exactly what I've been thinking about. I'd also prefer something simpler (i.e. less components to fail) than the ADE kit. That circuit runs through the fuse panel behind the glove box. I've got a Tuffy glove box so I'm going to install a heavy duty SPST switch with a cover into it and mount it on the glove box. Since I almost always open the glove box to get the stereo face plate out or put it away, flipping one switch will be pretty simple and I think secure.
'99 TJ Sport, 4.0 I6, 5 speed manual transmission, Hi Lift w/offroad kit, Viair 450C compressor, Garmin GPS, Skid Row Engine/Transmission, steering box & radiator skid plates, Kilby gas tank plate, AtoZ Fab full length rocker guards, Performance Accessories 1" Body Lift, OME 2.5" HD springs & shocks, JKS trackbars front & rear, BFG AT 33x12.5r15, EBC Yellow pads and Centric rotors