Bathroom planning - No suitable solution for the bathroom

Your last draft forces you to possibly run the wastewater pipe right down the middle of a wall on the ground floor. I don’t feel like searching the ground floor now.

Can't the toilet drain pipe be fitted with a 90-degree bend?

Where should it be relocated to?
under the shower is not possible if you like [Bodengleiche Dusche].

Why not reconsider the draft by post #34.

Here is another version with some more space for the dressing room. Alternatively with a door to the WC?

We like your suggestion from post 23 best. It will probably come down to a children + parent bathroom plus an additional storage room where the washing machine and dryer will go.