I have 6 dimmers on preorder.
I could use single gang double switches, similar to your planned light / fan switch. Home built in 1960
One application is front door…light switch for inside entry light and the other for outside entry/camera. I have inside lite on a sonoff device. Dont really need a smart switch f outside but would like one f inside
Another application is for a double gang. One one gang I’ll be waiting for your dimmer/fan switch. The other gang is a switched outside outlet plus a light switch. I am currently using wifi bulbs but a double zwave switch would be nice.
Elect boxes are cut into concrete block… I can and have put in larger boxes but it is a project. I dont know if there is enough demand (I guess just older houses have this issue) for manufacture but it is on my wish list