Neo Coolcam now has a zwave two button switch which fits in a single gang space. It’s not very intuitive because most people will think the top button is on and the bottom button is off rather than that each button controls a different device. But some community members are using it, in part just because it’s so inexpensive.
This device is also available on the EU Zwave frequency, so make sure you get the right one for your hub.
UK:
Zooz has recently released a zwave switch of this type With one dimmer switch and one on off switch together in a single gang space. This one is much more intuitive than the Coolcam.