In housing fan control

I’d like add automation to an existing ceiling fan. Is the Hampton Bay Universal Wink Enabled White Ceiling Fan Premier Remote Control the only/best option that goes inside the fan as opposed to in the switch box?

Yes, although some people also take the GE switches and put that inside the fan control canopy if they don’t have a neutral at the switchbox.

You might also take a look at the fan FAQ (this is a clickable link) and see if that gives you any ideas.