It looks like a simpler device, but if I read correctly it’s also a few inches long. I’m not sure if it will fit in the diffuser enclosure. Also, most instructional videos I watched had the Sonoff intercepting the power cable. I need to intercept the wire from the button-press (what would you call this wire?). Is this possible from the sonoff? The diffuser requires a button-press to activate.
I’m not proficient in EE, so sorry for the sloppy language. 