I once tried very amateurishly to move the bathtub and toilet:
In my opinion, there is no way around shortening the shower wall in the master bathroom a bit (already done), as it then becomes very tight to get to the shower. For this, I reduced the length of the shower in the children's bathroom by 11cm and gave an additional 11 cm of width each to the master and children's bathrooms. However, it could be tight in the children's bathroom and still tight at the washbasin :/