they make a manual climate control for the boxster, but it was used on cars without air conditioning (early euro cars, and the gt3 with deleted air conditioning). as it was manual you needed a new heater unit as well (the one in your car has little motors at each flapper, the one with dials just uses cables). you can find them on ebay in the UK and Europe.
so, it's possible to use oem parts but you have to change more than just the controller. dunno about other VAG parts.
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