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Don't see the point of speculating too much about 'the crowns of the seven kings'.
Apparently there are (or were) seven proper kingdoms according to Sauruman's knowledge. It is however unlikely that we readers are aware of all these kingdoms. In fact, it is probable that they didn't even exist as more than vague notions in Tolkiens head, and that seven is an arbitrary number.
You must also remember that Middle Earth is a big place and that the stories Tolkien wrote mainly concerns the north-western parts of it. In the east (where Sauruman travelled in the past) and in the south there would've been many lands inhabited by darkelves, men, dwarves and god known what else, even if there are no stories written about them.
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