Indeed that is a simple solution if the scope of itemArray is greater than just the function and you don't mind keeping that sizable array in memory. If you are not calling this multiple times this will work just fine. In other more complex scenarios you may need to use the above method.

Finally got back to looking at this, as we will be starting our upgrades to SP2013 in the next few months. It works like a charm. Thanks for the info, should help others with this in future.

+1 for providing a supported solution. I will see if I can jump onto my old VM and confirm the fix when I have time