I do have a “few” HCs, two of which have adjustable charcoal grates. The IAC has a leg socket spot welded to it, which sets onto the adjustment pipe. Intake airflow comes from the upright tube. The bottom of the IAC sets flush onto the tube to shut down airflow. Running a snake indirect is not really a possibility, except at lowest “open” setting. Can use a Weber basket (if you wanna raise & lower on the fly) to be able to sear, then finish indirect.
If you don’t mind, which style do you have a line on? Hinges Lid kettle, or Pedestal Smoker?
Pedestal has less range than kettle
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