The cryptic trick you can do is add a dummy function to your site.xml that points to the counting page instead of the .jar file. For example.
<feature url="http://yourcountersite.com/counterpage.php" id="" version="">
<category name="YourCategory"/>
</feature>
The update manager will contact the counter page when he tries to install material from your update site, but otherwise ignores this function.
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