Well, the Rhineland issue went against the Versailles Treaty so had the French had any balls, it could have been stopped there. As to Poland, well when you send three Army Groups smashing across another nation's borders, that pretty much nails the "starting a war" concept.
Certainly, but aren't you begging the question a bit? What occurred leading up to the invasion of Poland of which you speak? You seem to entirely disregard the whole Danzig and Corridor affairs, both examples of Polish aggression towards Germans within their jurisdiction. Also, Poland violated Versailles first by refusing to permit the political independence and self governance of Danzig.
