That sounds awesome - you should post a new thread for that with some pictures of what you have so far.
I can only upload images here, so I uploaded a small demo movie to YouTube: https://youtu.be/SqLMjwCkUjk
Hopefully it becomes clear what I have done using 2 SonOff devices to also enable “manual” control without using smartphone.
Offcourse it depends on WiFi to be available, but I don’t have an easy solution to wire everything
Just getting back in to automation with all the new stuff, but I had X-10 for years before, and x-10 has a/c dimming , so I guess R/F Bridge would be the answer.