I think it could be easy enough to pare down programmatically. You'd have to search by adding things like:
* 5+ accounts tweeting exactly the same message
* Not using the mobile app
* Fewer than 10 followers
* Fewer than 10 following
* Liked fewer than 10 tweets
* Retweeted fewer than 10 tweets
* Accounts created within 24 hours of each other
* Account creation metadata is similar
* Account less than 1 month old
You could probably come up with more criteria to help narrow the scope and play with the numbers. I would bet that you probably come up with hundreds to low thousands of accounts fitting those criteria at most. You could spend an hour scrolling through them looking for something suspicious - and I don't think it would take too long to put this kind of thing together if you had database access.