So, the decision has been made. We are sticking with the old floor plan because the washbasin at the bottom looked extremely cramped in the visualization. However, we moved past the WC to window height, which gained us 15 cm at the bottom and accordingly widened the passage to over 70 cm. There is still an 80 cm shower area in the front, and if that doesn’t work, we will just install a glass door.
We will seal off the window on the lower half.
We tried all variants and visualized them in 3D, but in the end, we returned to the original version with the suggestion from Hangman. Honestly, I wouldn't have thought that...