I know what you meant 
But for me unfortunately, that wouldn't be "fast and efficient" because I'd have to look at the keyboard for these shortcuts.
I don't really use the launcher ... maybe not yet. But for navigating (in lists, text, etc.) with the keyboard, I use a general system that works the same way in as many places as possible.
https://community.folivora.ai/t/keyboard-oriented-navigation-system/46919