https://www.toppreise.ch/preisvergleich/Ladegeraete-Netzadapter/NIKON-EP-5B-VEB00901-p237168 Digifuchs in Zurich might still have it. Otherwise, it looks generally bad all over Switzerland.

According to the technical data of the D7200, the EP-5B is compatible. Excerpt from the technical data: AC adapter EH-5b; requires battery compartment insert EP-5B (both optional accessories). Source: https://www.nikon.ch/de_CH/product/discontinued/digital-cameras/2020/d7200#tech_specs

No, the matching power supply unit EH-5B (https://www.digitec.ch/de/s1/product/nikon-eh-5b-netzadapter-netzadapter-kamera-stromversorgung-265194) is not included in the scope of delivery.

Yes, it works perfectly.