You could always use the Scion of Kyuss template from Dragon #307 for more powerful versions (9HD and up) of the spawn.
The specific article is called Risen Dead II by Gwendolyn F.M. Kestrel and it details 4 undead templates: Bodak Creatures, Ghoulish Creatures, Ghastly Creatures and Scions of Kyuss. Basically, it takes the above four undead and tranlates them into templates so that you can apply them to other creatures, for example, the article provides stats for an Ogre Mage Scion of Kyuss (CR10) which is pretty nasty.
The Scion of Kyuss specifically makes any humanoid, monstrous humanoid (of at least 9HD) or giant (of at least 13HD) into a "spawn of Kyuss" giving them the usual undead traits, fear aura, impant worm and what-not that a spawn of Kyuss normally gets, plus the Worm Expulsion supernatural ability and appropriate ability modifiers.
It's a good article.
Creative Director
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You might also want to check out issue #336 of Dragon. It features the "Ecology of the Spawn of Kyuss" and in that article is a template for the favored spawn of Kyuss. They're a little more powerful than the standard spawn (or those in the previously published template). This template can also be applied to more than just humanoid-shaped creatures. There are several favored spawn of Kyuss in the last few installments of the Adventure Path.
This has been buging me for a while, and I just think Spawn of Kyuss would make more sense as a template. As is, a first level character who turns into a spawnof Kyuss is just as powerful as a 20th level character.
Averil:
I have come up with one. I can send it to you if you like. Anyone can email me at ric_mohri@yahoo.com for it.
Ric