KeyBindJS

If you are making a modpack, I recommend using the "Smart Key Prompts" mod.
You can find more usage examples in the wiki

Below is an example of changing the default accessory menu key to ALT+X (moved under vanilla's Misc category) and removing the jump key binding:

KeyBindEvents.modify(event => {
    event.modifyKey('key.curios.open.desc', GLFM.GLFM_KEY_X)
    event.modifyModifier('key.curios.open.desc', KeyModifier.ALT)
    event.modifyCategory('key.curios.open.desc', 'key.categories.misc')

    event.remove('key.jump')
})