First of all the chances of you not being able to contact dispatch on a re-release are slim and none. Especially with the availability of SATNAV, HF phone patch, ACARS or ARINC via the bat phone or simply relaying through ATC. ATC has no idea that you are on a re-release, that is strictly a company procedure to allow you to dispatch with less fuel. As a captain and final authority of the flight you signed for, I doubt that as long as you have enough fuel to reach your destination and meet the FAR required arrival fuel the company can do little to fault your decision. Sometimes one has to use a little common sense as the captain of a flight, UPS or any other airline!!!