No, there is no non-full cat-back system that won't require a cut.
Also, the only reason why you should spend the extra money for a direct-fit (still requires a cut) than muffler welded-in by a shop is because you don't have a muffler shop nearby you can use.
There is no reason why your dealership should care about anything from the cat-back. My service advisor did recommend that if I went with a aftermarket muffler, to get it welded in, since some of the direct-fits have a tendency to get loose over time. In fact, most direct-fit mufflers do recommended welding a bead on the clamp to prevent it from getting loose.
Either way, keep your stock muffler in case you want to resell/trade your truck in the future, since quite a few dealerships will ding you on resale for aftermarket exhaust, especially if it's loud. Even if you have a muffler shop weld in an aftermarket muffler, it's easy to put the stock one back in and save you $100 or so.