So do this thought experiment: Apple is ordered to create fbiOS, and one or more engineers baulks and says: "This order is compelling me to write code, thereby compelling speech from me, and I refuse to write it." And she's sent to jail for contempt of court.

Your argument rests heavily on code that exists. It's much easier to argue that isn't speech just because it's easier to call it an object, an artifact. A gear. A knob. But before code is written, it is in the realm of thoughts.