@toggledbits No, I totally grokked what you were explaining, it's just that there's a (relatively new) well-documented problem of Amazon Alexa now only looking at port 80 during Discovery. Hence, whatever solution one rigs to intercept its inquiries, it must originate on some device's HTTP port 80. And that simply cannot happen (without major surgery and risk) on the Synology NAS, even if you try to instruct a Docker container to open it (yields red box and stern warning). Just no can do.

therealdb is recommending a work-around using Vera, and I'm inclined to try that once I pin down where his info applies.