Zend certified PHP/Magento developer

Bulk assign products to new Magento Website -> Copy from Specific Storeview

I have a multi-website setup in my Magento.
Here i want assign all products from a not-default storeview (german) to my new website (austria)

When assigning one products (Products -> Choose product -> “Assign to website”: I’m offered the possibility to choose what website i want to copy the data from.
(This is convenient – but unfortunately this functionality is not offered when i want to “mass edit”)

If i do it by “Mass action” = it will only copy from “default store view” -> Which i can’t use for anything.

So basically my question is:
How can most easily copy all my product from a specific website/storeview to a new website/storeview from a not-default website/storeview?