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You would need a slightly larger set of words, but nonetheless an interesting solution.
Absolutely. Perhaps harvest words from blog spam.
It's a good backup solution as by the time Googlebot finds the cracked pages, it's a bit too late.

I'd set up a cron job to check the database once a day or 12 hours or so. That's more pre-emptive.

In my experience, Googlebot crawls all the freaking time if your site changes "all the freaking time".

So basically theres the possibility that you'll be crawled before your daily cron runs...

I think you're missing the point. These SEO hackers don't announce themselves by defacing your front page or deleting your database. They insert hidden links in your HTML to boost their PageRank and it's in their interests to go undetected for as long as possible.
I'm an SEO and know full well what they're doing. My daily cron job suggestion is to detect their activities.