Could you make your talk into a Powerpoint presentation? If so, you can record audio for each slide ahead of time. The beauty of this is that, if you stutter on a slide, you just record that slide again. As many times as it takes to get each slide fluently spoken (I have done that). Since you can do all that processing when you are alone, and since people who stutter are typically more fluent when alone, this may be easier than you think. Then, when you have all the slides fluently spoken, you can just "save" the presentation as an mp4 file. When you click on the mp4 file, the slides will be shown, and your voice annotations will be broadcast as well. This doesn't help you much in the post-talk question/answer period, if there is one, but at least your presentation will be smooth. We are working on a longer-term solution to your problem, called the Fluent Digital Twin, that will let you give fluent presentations over Zoom. Our software transcribes your speech into text in a way that magically removes disfluencies. Then we reconstruct the transcription back into speech, which can be used as an ersatz "mic" for Zoom. Let me know if you are interested in trying that.