I'm someone who usually cannot pass as fluent for more than a few sentences, but a while back I did an intensive speech therapy that left me much more fluent for a pretty long time (not perfectly so, and it was so wildly exhausting to try to keep up and so damaging to my mental health that I would not recommend it). One of the most surprising things about that was discovering how incredibly *stressful* it was to have to constantly think about whether people had noticed I stuttered, what they would think if I started stuttering now when I hadn't before, how to handle first-time reactions to my stuttering from people I'd already come to know, etc. (Also, not knowing what people's first impression of me was and what they were remembering for me. Weird as hell to try to deal with.) Honestly, in certain ways it was a relief when the speech therapy broke down and I returned to the stutter almost always being obvious on first meeting! I really like the pseudo-stutter trick for avoiding those particular anxiety spirals and am going to keep in my back pocket in case my stutter ever goes less obvious again.