>but I'd rather write Kaliningrad because those people are so damn thin-skinned, bordering on paranoia
In Kaliningrad, the locals colloquially call their city Koenig (short for Koenigsberg), they're totally fine with it. Although, the context matters, of course.
Nice to hear that, I guess it shouldn't be surprising that people who actually live there might be less concerned about a hypothetical reclaim than people hundreds of kilometers away. If you only know it from the map (well, that's also me) that's a what-if not rooted in reality one way or the other at all.
In Kaliningrad, the locals colloquially call their city Koenig (short for Koenigsberg), they're totally fine with it. Although, the context matters, of course.