I can only agree with . An office on the upper floor would solve many problems, and there is more than enough space for it if you just look at the size of the bathroom. Especially on the ground floor, you already have a somewhat higher space requirement with pantry, shower bathroom, technical room/utility room, etc. The staircase, which is supposed to be straight or with a landing, of course also takes up some extra space... And not having the staircase positioned in the entrance area, but also not in the living area, logically involves extra space as well.
Just so we understand each other correctly, I can absolutely understand all the wishes and would keep them as well. Simply put the office on the upper floor and start the floor plan anew, then all wishes can be fulfilled given the size.