The VVEL control shaft position sensor shares a connector with the throttles apparently. I never noticed in practice but just looked in the FSM and see they have the same connector part number. Those are several inches apart, how did you mix them up??
Anyway, the VVEL control shaft position sensor is integral to the VVEL Actuator assembly which is replaceable and not part of the VVEL mechanicals under the rocker covers. The service manual outlines procedure for replacing the actuator assembly and Nissan sells them in the parts department. They are around $600 from Nissan parts stores online. The sensor you would have toasted actually comes off the actuator assembly IIRC but Nissan doesn't want you to take it off so they don't sell it separately.
So, you do not have to replace the cylinder head to replace the VVEL actuator assembly with control shaft position sensor. Unless having this sensor damaged resulted in mechanical damage to the cylinder head, I dont think youd have to replace the head to solve your problems.
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