Bathroom accessible from 2 sides - What kind of locking system?

Without wanting to judge the floor plan itself, this will probably only be solvable with "smart" locks, i.e. motorized ones. And then some kind of "changeover switch"

... this will probably only be solvable with "smart" locks, meaning motorized ones. And then some kind of "changeover switch"

But you don't happen to have a concrete idea or a manufacturer for that, do you?

But you don’t happen to have a concrete idea or a manufacturer for that, do you?

That’s not necessary at the moment - with this floor plan - either. But already plan 5k€ for the door and lock/logic.

That’s not needed at the moment - with this floor plan - either.
But already plan for 5k€ for door and lock/logic.

I am fully aware that the plan is by no means mature. I am concerned with feasibility and sensibility. If someone here were to say, sure, buy product Z from XY, it costs 50€, then I would continue planning with the idea. If only prices over 5000€ are set, I would discard the idea and think of something else. I just thought that the forum "Ideenfindung" is meant for finding ideas.

But it is actually just a brainstorming draft...

Then I guess I’m still in time to give you a deterrent example where someone already had the same brilliant bathroom idea:

So, if it were my bathroom and I had such a "crazy" idea, I would install motorized locks and a small smart home based on [OpenHAB]. But I don’t have such ideas ;) . Not that my ideas are fundamentally better, but the bad ones are usually talked out of me in time. The motor lock [!surcharge!] for an exterior door costs at least 500€, for an interior door? You can build the smart home yourself with a lot of time for reading and implementation, starting at about 500€ (extra cables, [Controllino Max.], etc. or similar).