No, according to the ESTI, this is not permitted. Contact Galaxus, they must supply you with a CH fixed adapter free of charge. If they refuse, you can report it to the ESTI. They will then initiate an investigation: https://www.esti.admin.ch/de...
I also asked myself this question, as ordering from a CH shop would lead me to expect a CH plug. I am not satisfied with Galaxus in this respect either. However, so that I could do a function test and use the machine straight away, I promptly fitted a CH plug. Yours sincerely Stephan