Did this work for you? I haven’t tried that device handler, but if you are registering button presses, you should be good to link them into supporting smart apps. I’m using @thegilbertchan - "Cooper RF9500 (all buttons) device handler. I pair it with the Button Controller app.
Looking at the EricVitale RF9500 - Beast app, it appears to support both switch and button capabilities. Should also work with the Button Controller Smart App.