Hello,
Not much time to test this week-end but thought it would be rude to ignore you.
Yes WeeWx runs on the same server as the Homeassistant in a Docker as well. I configured the weather station to send its data to the IP of the server using port 9998. Weewx does then use Interceptor to collect the data.
The MQTT plugin for WeeWx works really well and if honest I could stay as it is now. I created sensor out of the MQTT message coming from WeeWX and it suits my need. I don’t do any automation with it. I just use it to display temperature and a general Wind Direction
The integration would be better as it “discovers” the sensor automatically
Hoping to do more troubleshooting in the next few days.