What is the most appropriate way to handle public Hanukkah candle-lighting, that is not in a shul, and that does not fulfill anyone’s obligation? Should we participate in Chabad public lightings? Should we have lightings at a shul Hanukkah party?
I agree with the assumption of your question—that the practice to light in shul with a berakha is itself a chiddush, and ein lecha bo ela chidusho (i.e. the ruling here cannot be extended to other cases) (not to mention that it might also have greater weight because it is dumya d’beit HaMikdash—analogized to the Beit HaMikdash). Thus, a public Chabad