I think I would do what you suggested at the top, VH.
First thing I'd do is ask the lawyer for an updated title commitment, speaking of updates. The standards just say "latest title commitment", so if we didn't get a fresh one, I'd carry the research forward ourselves, as needed. From there it would depend.
If I had been the PLS that did the original boundary & ALTA, I would do some careful review of any recorded conveyances from/to the property since my original work. Then a careful field survey of any changes on the site, or related to new deeds. I'd make the changes necessary to the plan, comply with the new ALTA standards, including re-running any field work as needed. I think that's it.
But if I were not the original surveyor, I would scrutinize everything about the survey. I might not re-run all the research and field work and calcs, but I'd satisfy myself that I liked how they were done. And redo where needed.
I wouldn't just change the date on the plan and ship it.