You could query this by selecting all computer resources from the Default Organizational View NOT IN the Custom View you created. Here's how this might look, though I just cobbled this together from a query designed to find Organizational Group name for a particular view. Scoping is not applied since this is raw SQL. Replace the first GUID you encounter with the GUID of the AD Organizational View (right-click the view and choose Properties). Replace the second GUID you encounter with the GUID of your custom view (right-click the view and choose Properties).
SELECT
v1.[Name] as 'ComputerName',
v1.Guid as 'ComputerGuid'
FROM
vComputer v1
JOIN ScopeMembership ON v1.Guid=ScopeMembership.ResourceGuid
JOIN ScopeCollection ON ScopeMembership.ScopeCollectionGuid=ScopeCollection.ScopeCollectionGuid
JOIN Item ON ScopeMembership.ScopeCollectionGuid=Item.SecurityGuid
WHERE (ScopeCollection.ScopeSetGuid='d8c07867-f25b-41af-9c6a-82c1086b2179'
AND v1.Guid NOT IN (SELECT
v1.Guid as 'ComputerGuid'
FROM
vComputer v1
JOIN ScopeMembership ON v1.Guid=ScopeMembership.ResourceGuid
JOIN ScopeCollection ON ScopeMembership.ScopeCollectionGuid=ScopeCollection.ScopeCollectionGuid
JOIN Item ON ScopeMembership.ScopeCollectionGuid=Item.SecurityGuid
WHERE (ScopeCollection.ScopeSetGuid='797d0ac8-6e1f-40c4-b972-e7185d1ee064')))