Note: if you want the latest release of this mod, please use the Quick Elytra Reborn. It is a full rewrite of this mod.
https://modrinth.com/mod/quick_hotkeys
https://www.curseforge.com/minecraft/mc-mods/quick-hotkeys

Quick Elytra

Quick Elytra adds 'Quality of Life' changes such as adding keybinds that swap items in your inventory.

Features

• A keybind that lets you swap your equipped elytra/chestplate. (v1.0.0)
  
  It prioritises equipment with the most enchantments/enchantment levels and durability.
  
  The default keybind is 'G' but it can easily be changed in the keybind control settings.
• A keybind that puts a Totem of Undying in your offhand if you don't already have one equipped. (v2.0.0)
  
  The default keybind is 'X' but it can easily be changed in the keybind control settings.
• Auto replant crops that are mined by a hoe. Use the config in the mod menu to change its functionality. (v3.0.0)
  
  This is untested on multiplayer servers so use at your own risk.

Downloads

https://www.modrinth.com/mod/quick-elytra

https://www.curseforge.com/minecraft/mc-mods/quick-elytra