Question about Schönenberger No Block Europe - Switzerland

No, travel plugs are not allowed. see second link below there point 1

The correct solution would be to use a fixed adapter. You can find them in the Digitec search under this keyword.
I can't tell you exactly which one. The information on the plug doesn't really tell you anything. You would also need to know the technical data for the device.

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Digitec (or any other Swiss dealer) is obliged to supply electrical appliances with a Swiss plug. If the appliance is supplied with a foreign plug, a suitable replacement cable should be supplied if the mains cable is pluggable or, alternatively, a suitable adapter if the mains cable is permanently connected.

If the appliance is delivered without a suitable plug, complain to the customer service and insist on a cable or an adapter, free of charge.

Info Digitec --> https://helpcenter.digitec.ch/hc...
Point 1 --> https://www.esti.admin.ch/de...