Ok, here’s a quick mockup: https://drive.google.com/file/d/1dWl61mMYFgDO3DAVQO-K_1UNZejk5CPC/view?usp=sharing
That’s pretty cool. I think for it to work you’d need to pitch-shift it up just a little, and then extend the shots before and after to give it a little breathing room. That should give it enough to blend and feel like something he’s saying just a little under his breath.