This is a modified version of the Yiddish keyboard for macOS, originally designed by Isaac Bleaman.
This version contains both combining and precomposed versions of the characters, combining the Yiddish Klal and Yiddish Klal Ligatur keyboards made by Bleaman.
Copy both Yiddish.keylayout and Yiddish.icns (dark mode icon only) to ~/Library/Keyboard Layouts.
Refer to this page for detailed instructions.
This keyboard is mainly based on Yiddish Klal, with precomposed characters available at the same key positions when pressing the ⌥ option key.
Additionally, Shift+D and Shift+G is now דּ and גּ respectively.