Can't find product codes on Steam

Didn't mean to pile any pressure on, sorry. As you said you are "there" intellectually already. Guess my real point was that I predict you are going to Bootcamp sooner or later anyway, or else restrict your style of play tremendously (or play something else entirely). So as long as it's probably going to happen, the Steam client install and even installing the game itself through Steam vs. Origin become comparatively trivial decisions to make after that.