create a spigot plugin that loads custom emojis that has a key that will be replaced for a value and generates a resource pack depending on the server version
Script // server version is 1.13.2 // Key is a word used for a emoji like "MyEmoji" // Value is the url for the emoji "https://cdn.discordapp.com/emojis/123456789.png" // replace "MyEmoji" in chat with "https://cdn.discordapp.com/emojis/123456789.png" // create a resource pack with the emojis in it