As long as steemit has nothing to solve this, it is easier with Steemoji. Its an Browser Plugin, which adds a Button to the Editor.
https://steemit.com/steemit/@dehenne/emojis-are-now-available-in-firefox-steemoji-meets-firefox
https://steemit.com/steemit/@dehenne/steemoji-0-5-0-easy-emojis