I dont have essentials kits, so im not sure if you can do this, but if you can add somthing from your inventory, I would recomend the plugin "GodTools". you can get any item enchanted to .128 (it's really .127, it dosent crash) with /gt. It's really nice.
Also, for example you can use /enchant <player> <id> [level] force
make sure you type "force" at the end. I hope this helps
