I like what you're suggesting.
Something i wanted to suggest, was to place a poll on this site.
Upon first visit to anywhere in this domain, be redirected to a single question, single answer poll.
The poll asks you to confirm awareness of the Hp catalog shutdown. Once you reply to the poll, like all polls, you aren't redirected again.
It should generate a count of people visiting this site without duplication. It would probably require either a cookie be set or login to track the user profile. Or simply a second question, have you already answered this? Which would void that poll query.
Just thinking aloud like you. Personally I'm excited to see the increase in traffic here. I wonder if the site could post existing recent traffic data at least.