Zigbee push-button switch that can trigger Alexa routines (and is cheap)

Indeed, yes, different people prefer different things. I'd seen the Shelley post and that specifically was what I didn't want - it says you need an app, a skill, patience, and to make a scene. Conversely, my solution needs building, but then that's it. It just works with any newer Echo (which I appreciate is not what everyone has).

I've just found that relying on apps and skills and scenes can be fragile. From time to time, something will go wrong, or need updating, or re-discovering, or signing in again to a cloud service.

I think the difference is that I could make another one of these and give it to the various other people I know who own Echos, and (as long as they have the Zigbee hub model!) they could use it. And it wouldn't go wrong quite so often as the other options.

There's no way they'd get something like the Shelley solution working in a month of Sundays. (Equally, they couldn't build one of mine themselves, admittedly.)

What I don't get is why nobody like Sonoff makes something like this. All they need is the same gubbins as they have inside the contact sensor, but operated by a push button. Maybe there just isn't the market.

I'm actually going to play around incorporating the box of tricks inside, for example, an item of furniture, such as a bedside cabinet, and then fitting a large push-button switch through the carcase, so that's all you see from the outside, if you see what I mean.