Your windbreak idea is a perpetuum mobile to carry the dirt as far as possible into the house: a windbreak works best "across" in front of the hallway. Enter, large doormat, wall space for shoes, coat rack, and a seat stool to the left or right of the door. Take off shoes, through the door to the hallway. With space for the dog to dry its paws, it is enough if the windbreak is 160 deep and rather "wide/across" next to the front door. A chimney flue is the highway for wind and dirt. Actually a wind accelerator instead of a windbreak.
Otherwise, all I can say is that you are happily wasting a lot of space and money for little benefit. The corner next to the piano, the main bathroom upstairs has enough space that is not so easy to use.
I am a big fan of fairly small houses because they contain a lot of experience and flow for efficiency. Old, small, or also modern small houses show how to live practically without sacrificing comfort. Planning bigger can always be done later. In any case, at the crucial points you have the flow of a "small middle row house" (kitchen, bathroom, hallway/windbreak, office); and where it hardly contributes to improving comfort and circulation you have the flair of luxury (central space all-room, large bathroom, exterior appearance). But you will hardly perceive it because you are not standing, for example, in the dead space in the middle of the bathroom enjoying it. It is just banal traffic space.
I do mourn a bit the money that will unfortunately fly out the window here at the expense of living quality. Regardless of the resale value. I probably would not risk that so easily.