No it is not the case… ferbulous already answered my original question. I hoped that my idea was original but fortunately (or unfortunately) Sonoff has already manufactured it, albeit in one product only. But I guess it is better than no product at all.
What in my description of the situation trips you off? It is quite simple.
The only places I can install relays and still have physical switch function plus smarts, are:
- in the switch box (but needs to be no-neutral relay, that is what they are built for, but they have some issues nowadays with low wattage LED lighting)
- on ceiling where I have neutral and SWITCHED live. Which is what I was asking. Which is what Magic Switch Mode of the Basic R4 apparently provides.
I ordered a bunch of R4 and will receive them in a couple of days, so I will flash esphome or tasmota on them and see.