I haven’t tried it. but this plugin looks like it satisfies your alternative option
http://wordpress.org/extend/plugins/mu-manage-comments-plugin/
Conveniently shows a list of blogs with spam or unmoderated comments so that the Network Administrator can manage the the comments on network blogs. The list shows counts by blog with links to each comment.
However. the plugin warns that it might not be suitable for sites with large number of blogs – you may need to tune your PHP timeout value.
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