You can rename the Board and Schematic from the Navigator once the schematic is open rather than edit the project file directly, you will then need to forward annotate to get the design back in sync. There isn't any functionality built in to do everything you require in this scenario. As for the @ properties, once you've done the rename in the navigator run 'Update Other Objects - Properties' as you would when making changes in the existing design to get the latest time and other border data.
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