No, an adapter is not automatically supplied. I could not detect any plastic smell. So I'm going to cut off the DE plug in order to fit a CH plug... ;-)

I find it tragic that you don't supply a Swiss plug, as we live in Switzerland!
I find it more tragic that they still don't do it despite reports, so every new buyer has the same circumstances. Not praiseworthy at all:

I received the plug quickly and without any problems.

I don't smell anything of plastic and my nose is very sensitive to it ;-)