Another possibility would be to cruise the used parts forum here for a used climate control switch panel. You could try Yotadiesel, who is moving parts from a 300d now....

http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/325271-1985-300td-part-out.html

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22