If you have a lift, if no one else can help, and if you can find him, maybe you can hire... the @Dabbler.The professional movers, to a one, refused to take the job at any price: too dangerous to do.
Trying again...I don't see the picture. A simple plywood cradle with 2X4s cut out to fit...
That's basically how the piano cradle works. The key is that the wheels at the corner are in contact whether the item is laid down or stood up. That makes it "easier" to manipulate. Not easy but somewhat less difficult. The frame doesn't even have to be super-strong since it is securely strapped to the item being moved.The stairs are covered with 2X8 on flat and we have a wheeled platform for dragging it up. So the cradle will be just 3/4 plywood with 2 X 4s cut to match the contour of the spine of the machine.