ᐅ Direction of door swing and position of bathroom door on the upper floor

Our current door opens inward toward the shower, and every time I think, who came up with this design? The handle of the room door always hits the glass shower door if you open it too far. Opening toward the sink might not be ideal either, especially if you want to place something between the door and the sink—like a cabinet or similar—with a depth of 50cm (20 inches), there are plenty of options.

Opening the door outward would really be the better alternative. Do you have the rest of the floor plan for the level?

Now the decision depends solely on the 40 cm (16 inches) or 50 cm (20 inches) wall distance, as they are beginning to build the upper floor masonry.
Remaining floor plan:

Outside is difficult since the hallway runs along there. Fixtures in the bathroom will have a built-up wall frame on both sides (however, probably only 3 cm (1 inch) on the shower and bathtub sides according to the plumbing specialist). The built-up wall frame on the washbasin side will only extend up to the basin, so that a bathroom cabinet (approx. 30 cm (12 inches)) can be attached next to it.

For purely aesthetic reasons, I would also avoid having the door open outward. All the other doors open inward as well.