Aside from Sedra Miketz, is there another place in Chumash where a dargah is not followed by a tvir within 3 words?
Lots of places. It is true that darga is usually the servitor (meshares) of tevir, but it's not exclusively so. It can also precede munach and revi'i (e.g., Gen. 41:3 and Num. 4:12,14), and (rarely) mercha-kefulah and tipcha (e.g., Gen. 27:25).