You can use emoticons by using their specific unicode.
https://github.com/TwistedAsylumMC/bedrock-unicode-characters
In 1.14.0.3 this bug is even worse because the capes are simply overwritten with the "Founder-Edition"-Cape, so you don't have these capes anymore.
I think this is not possible, but maybe you can find a way to use unicodes as input. I am sorry.