Agreed. I wouldn't try it myself. However I rate your chances of success at 30%
based on how nice Southwest employees usually are. If you show any attitude of entitlement, your chances will drop below 10%. Just say you must have misunderstood and let them decide to do you a favor. Ideally, you should not even ask, but that takes a very smooth touch that few of us have.

Good luck, and please post a full report of how it went, leaving out any identifying information that might harm employees who did you a favor.