Creating the Dynamic Named Range itself is simple enough, eg:
When creating the PT you would enter _PTData as source
(if you continue to use existing 2007 versions you can go to Pivot Table Options bar on Ribbon [when PT active] and click Change Data Source)
In theory you can use a Change event on the Application Data object to refresh the PT Cache(s) as and when that data is altered:
but you may need to be careful regards positioning of the Pivots
In reality - I would suggest creating a back up and running some tests to see if you can get what you want.
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