How to make custom Discord client commands

Question

The feature I want to make is a custom command to use emojis because the original command only allows alphanumeric characters to be used as emoji names. This a big downside when the target audience is from non-English culture. I have searched online, and every post is talking about custom bot commands. I don't want this. I don't want to compromise the quality of the emoji system by making a bot reply to every custom emoji command. So when the user types in command something like [웃음] (which means smile in Korean), the system recognize it and outputs an emoji just like the :smile command in Discord.
I am asking this question because I couldn't find relevant information on this topic. I am asking for some good starting points to get this feature started.