I ended up swapping out the stock device driver for this one: Lutron and Hue = Aurora.
You lose the button capability but both off and on work, which is what I needed. I also commented out line 76 //sendEvent(name: "switch", value: "on") because in my use case I didn't want the switch to turn on when I adjusted the dimmer. I want it to toggle on and off only when I press the button. The dimmer still works as expected. I'm not sure what functionality is missing. @bertabcd1234 said it was a WIP so I don't know if there is any updated code anywhere. In any case it is working for my use case. I couldn't get the stock device driver to do what I needed.