The biggest problem is finding the right door lock. I hardly know anyone in Switzerland who meets all the initial conditions. It needs an emergency and danger function, must work from both sides even if a key is inserted and must turn the same way from both sides. You also need the right size (depending on the door/frame). You can measure everything. But now the problem. In almost no shop is this information complete for the cylinders, especially not in the online shops. So it's very difficult to order a suitable lock online. I only found this one, but it's from Germany https://www.schloss-profi.ch/
You can specify everything here and know what you're getting. The key is too thick because of the clip, but you can remove it. The only website from Switzerland that offers something similar is https://www.glametec.ch/ , unfortunately some information is missing there, which would be important for the use with a Nuki.
It seems to me that there is still a need to catch up on the Swiss market.

Question

The biggest problem is finding the right door lock. I hardly know anyone in Switzerland who meets all the initial conditions. It needs an emergency and danger function, must work from both sides even if a key is inserted and must turn the same way from both sides. You also need the right size (depending on the door/frame). You can measure everything. But now the problem. In almost no shop is this information complete for the cylinders, especially not in the online shops. So it's very difficult to order a suitable lock online. I only found this one, but it's from Germany https://www.schloss-profi.ch/
You can specify everything here and know what you're getting. The key is too thick because of the clip, but you can remove it. The only website from Switzerland that offers something similar is https://www.glametec.ch/ , unfortunately some information is missing there, which would be important for the use with a Nuki. 
It seems to me that there is still a need to catch up on the Swiss market.

Answer

The Nuki can also be used without the so-called priority function (= lock can be turned from the outside even if a key is inserted inside). Of course, this is only recommended if there is a second entrance. In a flat with only one entrance door, there is a risk that you lock yourself out if the Nuki does not work anymore.

I ordered a locking cylinder from www.fand.ch. I was able to enter all the details in the form that is available for download. The cylinder was then delivered directly by DormaKaba. But the price is steep and higher than the price for the Nuki.

I recommend contacting a locksmith of your choice and getting a brief consultation. No problem at all!

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