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I've been using rofi now for about 4 years. May look into supplementing dmenu in.

i3 has modes which is sets of keybindings enabled as you press the key to enter the mode. Tapping right shift enters command mode wherein many bindings are available but notably hitting o followed by a letter key opens the app bound to the variable $appkey_[letter]

To bind b to firefox appkey b firefox to open firefox <rshift> o b

If you decide you like chromium better tomorrow appkey b chromium.

If you want b to open a longer command appkey b "some long command here"

Yeah I use i3, but make explicit shortcuts sparingly (pretty much only a terminal shortcut), muscle memory has it's limits, and a lot of mine is consumed by vim.. For the rest, dmenu.

I believe filtering on programs that actually have a gui by using .desktop files and using their icons while at it is significantly more convenient. i3-dmenu-desktop, despite its composability, was insanely slow, so I switched to rofi as soon as that became available.

well, you could avoid a fork by using something like awesomewm, where pressing the launcher shortcut will just open a window inside the wm directly. certainly more efficient, not simpler though.