Wallwarts by definition are AC>DC devices.
I fyou wanted to use a AC powerstrip to power the devices wall warts, you'll have to buy a Power Invertor to go between the cigarette output and the power strip. This invertor will convert the 12vDC to 120vAC.
There is a taper here in Raleigh that uses one of these emergency car charger thingies. Has lights, and 2x cig outs, and runs everything for 20 some hours he says. He uses a power invertor into a power strip for his DC devices: his UA5 and JB3.
Depending, it may be easier to get a DC>DC convertor, something that will convert 12vDC to 9vDC and/or 5vDC.
Terry