Rhodesy sells light switch adapters for the Hue Smart Button - Hueblog.com
Philips Hue White Medium Lumen (75W) Smart Button Starter Kit, Hub Included, Works with Amazon Alexa, Google Assistant, Apple HomeKit (New Version) - - Amazon.com
Amazon.com: Philips Hue Smart Button for Hue Smart Lights, Smart Light Control, (Hue Hub Required), Pack of 1 White : Industrial & Scientific