Short and to the point: is it possible within the bounds of reality to have the Soviets ask for/coerce support out of the Warsaw Pact for the Soviet-Afghan War, and what if anything changes in the war if you get say 50k extra troops on the ground?
Disclaimer: if someone presents me with a plausible way to make this happen there will be NVA in Afghanistan, even though at the moment my TL is in late 1985 so the war IOTL is starting to draw down by then.