Download 2 files US.icns and US.keylayout to your computer. Copy them to ~/Library/Keyboard\ Layouts/
git clone https://github.com/4unkur/macos-custom-us-keylayout.git
cd macos-custom-us-keylayout
sudo cp US.* /Library/Keyboard\ Layouts/
Then open "System Preferences" Click on "Input Sources" tab Click "+" button Select "Others" and you should see US (with US flag) Choose it then click "Add"
That's it. In order to type emoji, just hold option (alt) button and press the key.
This is the layout:
