"If we still had the Saturn V hardware, it would be a possible to re-equip the system with new computers running modern code. If a B-52 can still fly after all these years there is no reason why a Saturn V could not also."
Unlike the BUFF, the computers on the Saturn V are critical to safely flying the thing. Test-flying an expendable vehicle to make sure you coded it right is kind of pricey.
Everything is pricey when you're dealing with expendable rockets -- no argument there. But when you couple the capability & reliability of modern electronics with our more advanced abilities to simulate flights using supercomputers, I'd say it would be do-able. We're talking about a hypothetical-with-a-hypothetical, of course. None of this was ever going to happen.