It is possible to fit a T12 plug yourself:
Max Hauri plug T12 black open

Or an adapter:
Max Hauri Fixadapter (CH, 3-pole type J, Schuko)

If you decide which solution suits you, please contact customer service. I am sure they will accommodate you and deliver the item free of charge:

Private customers
galaxus@galaxus.ch
+41 44 575 98 00
Monday - Friday:
09:00 - 18:00

Hello Hurlikus
Please contact the customer service. The community cannot help you here.
However, Digitec will certainly send you a CH cable.