Hey @Lukas913 ! Welcome to LST :)
Your struggle is personal to me from a couple different angles. On the one hand, I'm a speech therapist and have seen face-to-face how difficult stuttering is for people. It can be absolutely disabling if you let it. And also, I have my own health challenges that I'm attacking head on, and using tattoos as a way to help me deal with them.
I don't think your idea about a person with a word trying to come out is a bad one, but I think Pugilist's advice about this is excellent and I would encourage you to take a less literal approach to it if you can.
(When I was reading your first post in this thread the first thing that came to my mind was "dragon" :) )