The Sanaspnas trail drops down from the top of the Rothorn lift down into a valley, then loops around the front side of the mountain. But if you turn left in the valley, you can hike a bike up to access the Welschtobel ride.
Here in the US, "lift rides" and "backcountry" are two mutually-exclusive terms. But in Europe, they don't have to be. On my second day riding in Switzerland we used a pair…