These are all great questions, and it sounds like a very practical and interesting project, but it’s pretty off-topic for this thread.
Could you please start a new thread about this project and that way people can give you specific ideas and you can brainstorm about it there.
You can add your new thread in the following section of the forum.
Projects & Stories - SmartThings Community
Maybe give it a title like “Need ideas for keeping my RF fan/light synchronized with ST”
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