Frankly, I didn't care about these minor details.
When did the Grenzmark get distributed IOTL? Nazi times? Nevertheless, it will have to get distributed, as at least that part of the German-Polish will eventually be accepted as status quo. I got that whole Grenzmark issue bleached out by erasing the internal borders of Prussia. You may put Schneidemühl to Pomerania being geographically sensible, you may put it to Brandenburg if they already shared a constituency with Frankfurt/Oder, these are details I switched off for a moment to get to the core of the topic.
Of course, Saarland is supposed to be part of the Reich from 1935 on, I'm just too lazy to draw borders.
I also suppose to bring Danzig back into the Reich in the 1930s-40s. And I even didn't mention Austria that I'd supposed to join the Reich as one whole state.