mine stick out that far because of the extra wide axles I used. but my rims have 4" of backspacing so they still pivot pretty much on their center. if you tried to replicate the look but using the Jeep axles, the tires would then pivot on the inside edge and the outside edge of the tire would sweep around in a wide arc, smacking your fenders up pretty bad.
just about any aftermarket 15x8 rim will make the tires stick out a bit more than they are now. Problem is that the tires will then rub on the flares. not as bad as the rims you were contemplating, but rub none the less.
30x9.5s or some 31x10.5s will fit with the stock rims on a stock Jeep. 31s will rub a bit on the control arm. WJ lower control arms will fix this. (they have a bend in them)
if it's just the rear that bugs you, a pair of quality hub-centric wheel spacers (like the spidertrax) will help the rear tires poke out to match the front.