Allow bots to have emoji not tied to any server

I have a bot that displays various game information and uses icons from the game to jazz up the messages. At the moment, I'm managing 4 servers that only have the bot in it just so I can have 200 emoji slots, which I'm outgrowing as more features are added to the game.

It would be great if I could upload emoji specific to the bot that does not need a server, that has a higher limit (perhaps boostable with premium features).