Chrisintexas - this 'problem' was 'solved' years ago by Dan Wesson.
http://www.gunbroker.com/Auction/Vie...Item=305702558
A .357 with four interchangeable barrels of 2.5, 4, 6 and 8 inch size.
Note: this really did not 'solve' the problem because there are many, MANY factors to consider when buying a gun and barrel length is just one of them and sometimes not even the most important one.
The Dan Wesson Pistol Pack really caught my attention when it came out and I've always imagined owning one but they were expensive back then and still pretty pricey today.