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Hi Adam,
By reading your code it seems you've taken the good road already.
You say you get a blank page... do you have errors turned on? https://drupal.org/node/1056468
Regarding the call to view, you need to use views_get_view_result() to manually execute the view while in the form_alter. Then only you will be able to get the results count.
Hope that will help you.
Cheers!