pretty sure my 4xinnovations skids completely cover my converters. Probably more than some want to spend or install, but my 4runner's belly is completely slick from the steering rack to the transfer case/exhaust crossover. great for rough trails, but also a good theft deterrent.
I know some companies make their skids in aluminum for those that are weight-conscious.
Might help you sell the idea to your significant other if you call it a "theft-deterrant" rather than offroad skid plates.