@Sonkoly I have not, but the idea crossed my mind. Did you give it a shot? What were your results?

I've been hoping for a Kasa fan switch for over a year now. I recently bought a Treatlife Ceiling Fan Switch which does exactly what I want, for a room where we change the fan speed fairly regularly. I'm still hoping for a Kasa fan switch before purchasing more for other rooms. But, the Treatlife switch might fill the gap for you, too.

Just wanted to step in here and comment about the Treatlife switches. I bought some based on many replies and reviews such as the ones above, but the Treatlife 3-way dimmer switches (DS02) are sold in a 2 pack but bizarrely don't work together as a 3-way switch. They expect you to retain a simple switch, specifically in the 2nd location in a standard 3-way switch design. This was a rude awakening for me as I thought I'd be able to have dimming control at both locations, or at least at the entrance I use 90% of the time which happened to be the 2nd location in my case. 

Unfortunatly I'm not finding many better options as I continue to research. Wanting fan control, light switch with dimmer, and a wifi smart switch all in 1-gang seems to be impossible to find in a 3-way configuration at the moment. I'm finding solutions for fan and light in separate switches, but the market is enemic at best. I hope TP Link makes a fan control switch and/or a combined switch that is compatible with 3-way dimming just like their KS230, but with support for fan speed controller (it's important to note that this is different than incandescent or LED/MLV controller for safety purposes). 

Maybe for now I'll resign to using Kasa 3-way switch without a dimmer, combined with a secondary smart controller in the ceiling fan canopy... I imagine this will lead to me needing to give 2 voice commands, but that seems to be the best I can do at the moment, and anyway turning the fan off and on is the more common command.