Providing a default value for an Entity Reference Field using Views Bulk Operations
I figured this out.

Views > Create New View > Content type 'Schools'

Format > Table

Add Fields > Title

Add Fields > Bulk Operations (Content) > Bulk Operations > Modify Entity Values > 'Your Entity Reference Field' > Skip Confirmation Step > Show Token Values

done - navigate the views bulk operations URL, select all of your nodes and apply the changes ... You might need to adjust the pager options in the view to see all of your nodes, and also disable the feeds importer while you adjust the nodes associated with it...