Yeah, a astronomical function is a great idea, and one not easily replicated on another planet with different stars.
Personally, I can't see the Vulcans rebuilding things wholesale unless there is some specific function, even if that function is ceremonial. I think they would concentrate on the small things, like appropriate clothing for ceremonies, first. Giant statues will be last on the list, if on the list at all (though I bet there'll be one cranky archaeologist who was off on another planet at the time who says they MUST recreate the statues; another similar type of scholar who says they MUST NOT and so on...)
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Personally, I can't see the Vulcans rebuilding things wholesale unless there is some specific function, even if that function is ceremonial. I think they would concentrate on the small things, like appropriate clothing for ceremonies, first. Giant statues will be last on the list, if on the list at all (though I bet there'll be one cranky archaeologist who was off on another planet at the time who says they MUST recreate the statues; another similar type of scholar who says they MUST NOT and so on...)