The controller looks “neat” but you’ll need a pretty hefty 12 - 24v DC power supply and a way to wire it so its not a fire hazard. And as you said no way to make it smart other then a smart switch or relay but that would just cut it’s power…not sure if it would go back to what it was set to when turned back on.
There is a ESP8266 based controller that works with RGB lights…might want to check that out: [RELEASE] SmartLife (H801) RGBW LED Strip Wifi Controller & Bulb . Not sure on how much it can power but I know they make RGB “repeaters” that take the signal and resend with injected power.