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My suggestion would be to play the kobolds as they are and let your players have a "oh, we've fought these before" feel throughout the module. Do this up until you get to Merlokrep and his guards, which I suggest playing as Xerxes from "300". If the combination of skilled fighting AND spellslinging doesn't leave an impression on your PCs, the distinct change from the "yap-yap" voice to a deep, smooth, almost sensual one for the kobold king should do the trick.
I had Merlokrep be quite eloquent in his speaking to the party, even convincing them to sit down to a nice meal of insects and grubs (I had Indiana Jones on my mind). The party and the king conversed over "dinner", until the wrong thing was said and it broke down into a fight that ended with a party TPK. Kobolds who coup-de-grace sleeping party members is just something awful.