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One City that doesn't get mentioned much here is Tübingen(~70k) in the south. Its pretty much as liberal as Berlin, probably the most accepting city under 500k population in Germany. It is ridiculously beautiful with a huge old town, and as someone who is queer and spends time there often, it feels very safe. The queer community is huge because there is tons of students. It has amazing City Planning / Cycling Infrastructure / Public Transport, and the surrounding nature is beautiful as well.

I think this is the ideal solution, but you should be able to share the groups you create with others, exactly like multireddits. That way, collections of these groups could be made available to others, for them to add to their feed.