You should know: RandomPatches, by TheRandomLabs, does this and more! If you're just casually browsing for mods to install, psst, you should probably get that one instead. It's a great mod with lots of cool patches.
This is a tiny (core)mod that adds an option to the vanilla controls GUI for the narrator, implementing MC-122645.
It defaults to Ctrl-B, the same as vanilla's default, but now you can change it (or just unbind it) through the keybindings menu. The option is located under "Miscellaneous".
A common use case is avoiding key conflicts with mods that default to B; fat-fingering and hitting Ctrl by accident can toggle on the narrator, and it's really frustrating. Also useful if you like to use the Ctrl-B key combination for something else. Or: if you just don't like the narrator ;)
Source available on Github. This is public domain software under CC0, so you're free to put this into modpacks, repost it wherever you want, fork it, port it, etc etc.
Questions? Comments? Just lonely? Join me on Discord: https://quat1024.github.io/discord/