Hi Bemo47,
I found these adapters, but the problem I have is that they stick out even more. The Shelly TRV already sticks out a lot. With the adapter it is even more. The ring actually takes up less space. Also, I'll probably need a lot more TRV's and if I print them myself it's a lot cheaper.
I actually run in quite some issues with the Shelly TRV and they work very unreliable even with the Shelly App. Integration in Home Assistant is not working at all. What is your experience with it?