1. Go to Settings ➜ Accessibility ➜ Siri
  2. Turn on "Type to Siri"
  3. Go to the Shortcuts app
  4. Create shortcuts that ask for input with short names (they're not case sensitive)
  5. Your iPhone now has a command palette

Show A screenshot of an iPhone with Siri being typed to and running a shortcut with the name "dg". The shortcut searches DuckDuckGo. The input is "Siri as a command palette".