I also want to use Shelly dimmers, but I haven’t found simple stateless light switches. I want automation and app control in many cases, but also want simple tactile button for on/off or hold for brightness control. Amazingly hard to find.
That's how I have my lights setup - normal light switches (switched live) will toggle the switch sensor which is picked up by HomeAssistant which then either toggles the relay (for non smart lights) or sends a command to a light group (Zigbee IKEA Tradfri bulbs, using a Sonoff Zigbee dongle for comms) to turn on or off.
The only issue you might have is that they require a neutral, so unless you have a neutral behind each switch you'll need to put the Shelly elsewhere, either in the light fitting or ceiling (in my case).
They no longer seem to offer them. But the replacement might work as well. Support for the device was merged into Z2M last month so not sure if it's already included in the latest release.
1. Predecesor of this: https://www.ikea.com/nl/en/p/somrig-shortcut-button-white-sm...