Update a collection of pages in single button

Hi,

We need something that can solve the following scenario:
We are updating a couple of pages in our site in a specific day and time and we prepare the pages ahead of time.
We need something that can save the pages changes as a draft and when the time for update arrives we just publish it in one place and it will update all the changed pages.

Also, if we could make the update action triggered from an outsource place it will be even better.

All plugins I found just allows to schedule each page separately, we need something like that but that can collect a couple of page changes and have the ability to trigger the update.

Let me know if you need more information.

Thanks,
Oren