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That problem is solved by the subsecond crate (an offspring of the Dioxus UI framework), demo here: https://youtu.be/Kl90J5RmPxY?t=1288

It's not integrated in Nannou specifically, but they're showing off Bevy and ratatui in that demo, both very popular frameworks in the Rust world. (In fact, Nannou is in the process of being rebuilt on top of Bevy.)

I don’t know if something is wrong with my mental model, but it seems weird to me that it would take hundreds of milliseconds to patch a function pointer.

That's true! But I was amazed to see makepad.nl's performances. That's written in Rust and I saw one of the authors, Rik, explain how they make it so fast to build. Praiseworthy job that shows that with care one can go far.

Yes, I wanted to play with things like this, I love Rust, but nowadays I use things built in Python or Lua (like love2d) -- because I need fast interactivity for visual creative coding.