I don't think this should be a problem. After all, HN is an English-speaking community. What is usually done in such situations is, ask if there are any non-Ger

I don't think this should be a problem. After all, HN is an English-speaking community. What is usually done in such situations is, ask if there are any non-German speakers (or should that be German non-speakers?!) in the group and if yes, switch to English. Private conversations are what they are, of course.