Read about how I got my non-HomeKit devices working in HomeKit using Homebridge. This makes it easy to use Siri (via an Apple Watch) to control my smart devices.
Sometimes, you need a notification to do something when you tap on it like opening an app or running a shortcut. Unfortunately, the native 'Show Notification' in iOS Shortcuts is non-actionable and therefore lacking. Read about how to take advantage of actionable notifications in iOS Shortcuts.