would carry strong nationalistic connotation
A lot of people think there are communists and socialists under every bush too. Should we ban the word "social" because of this?
You might consider offenes.land or weites.land as even better alternatives.
Neither the Duden dictionary nor the DWDS (German-language standard works on the German language) contain any reference to a negative connotation with regard to the noun ‘Land, das’.
Nor am I aware of any right-wing propaganda peddling ‘das Land’. At some point it becomes impossible to communicate normally with a language because every word is somehow ‘ostracised’... maybe all that will be left is sign language with harmless emojis.
Make what into a picture? And how would that be a good advertisement?