So you would like to get your hands on a Bluetooth keyboard that can pair to multiple devices? The HP 460 Multi-Device Bluetooth Keyboard has you covered. It is designed to work with Windows, macOS, iPadOS, Chrome OS, or Android.
This keyboard has a button that lets you switch source quickly. It also has 12 programmable shortcut keys. Its battery lasts up to 24 months (2 x AAA batteries). You can find out more about it here.