Using a zig-a-zig-ah stick in combination with a raspberry pi 3/4 running zigbee2mqtt is surprisingly stable, compared to the slightly cheaper alternatives [0] and works quite okay in combination with home assistant.

But to be honest I'll be looking into getting a Home Assistant Yellow as well as this seems to be easier.

[0]: https://electrolama.com/projects/zig-a-zig-ah/