I, too, would be interested to see the conversion.
Suggestions for a conversion:
1) Prime: Charisma
2) BtH: inferior to the one of 3.5. That is, if d20 has wizard's BAB, conversion should get CnC wizard's BtH instead.
3) HD: identical
4) Armors and weapons: identical
5) Saves & skills: replaced by a Siege check.
6) Class features: extract what really makes the warlock apart, and suppress things like "+2 bonus to something" or what not. Simplify where lists of powers are considered. It's not necessary to tone down powers, as CnC wizards are more powerful than 3e wizards in their context.