It’s going to depend on how you end up setting up your light and fan. Some people control the light from the wall and some control the fan. Others do it just the opposite. You will need to see what wiring options you have and then decide which way works best for you. I did not use a Micro switch to control the light.
I set mine up so the light was controlled by the switch since that is what we use the most on that specific fan / light combination. If it were say my living room one it would be the opposite way for me since in there we use the fan more that the light.
To answer your question about other ways to control the hidden switch be it fan or light. Yes you can use other switches battery or whatever to control it. We have Minimotes that we currently use to control both the light and the fan speed from one remote. You could also use a battery operated switch to tell smart things you want to change the light or fan. In turn your settings in smart things would perform the function.
There is a lot of different ways to go about this and everyone has their personal preference. Somewhere else on another topic @JDRoberts gave me an example of a good battery switch that mounts on the wall. I’ll try to find that and post it here if he doesn’t beat me to it.
Just remember you HAVE to have a fan controller for the fan. A regular dimmer will not work for the fan. You can use a regular dimmer for your light just not the fan.
Either way your going to have to do more wiring than just connecting the wires where the old switch use to be. If you are not comfortable doing this or able to safely. I HIGHLY recommend hiring an electrician.