> Neat and probably works on most dishwasher models, but not enough temperature precision for my comfort level.

I'm not so sure. IIRC, about a decade or two ago, dishwasher energy efficiency regulations forced design changes that really neutered dishwasher drying cycles. It does seem like they don't get as hot as they used to while drying. I wouldn't be surprised if this recipe worked in older dishwashers that were around when it was first popularized, but doesn't in more modern ones.