In my opinion, the answer depends on the reason for which you choose a design pressure substantially greater than operating pressure. Often this is what is called "good practice" but exceeds Codes requirements.
Proceeding in this way, you/ your Company people/ are conservative adding a substantial margin to get a design pressure and later realize the result may be not conservative versus flexibility/ stress calculation. "More reasonable" is to revise this procedure in case you got real problems following it.