I’m using keyboard maestro(KM) to type emojis like in notion just one keystroke. (and even tags)
let me show you some examples.
I’m setting one keystroke [option key(⌥) + D] to type Horizontal line(Divider)
hope you guys to be more productive!
Custom Emoji use the same method.
but the difference is you should make custom 16x16pixel image first using Photoshop or Affinity Photo, image2icon, and any other tools.