People have taken a lot of different approaches to this.
One of the most popular is to wall mount an inexpensive WiFi Phone and then just put an app on it. Gives you total control of all features and the cost is actually lower than a lot of the other solutions. So for most people it comes down to aesthetics. Either you like it or you don’t.
Another option is to choose one of the multibutton devices so that then you are selecting from some predefined scenes. If you use the popular remotetec eight button device, each button supports press, double press, and long hold, so that gives you 24 scenes from one device. It’s about the same size as a single gang light switch, although I think most people mount it horizontally.
The homeseer switch. Looks like a regular switch, but supports single tap, double tap, and triple tap, on both the top rocker and the bottom rocker. So some people like that if they only have a couple of scenes they want to switch between. But that one is not intuitive for guests the way the other two are.
Sunricher makes a zwave RGBW control Wall switch, but I don’t know anywhere to buy it in the US. You would need to contact them to see who is distributing it.
@adamv has the EU version working: