This is an idea I had some time ago for displaying clojure code in emacs, inspired somewhat by org mode (and probably other stuff I can't remember): https://gre.gorio.ch/lhisp-mode/lhisp-mode. What do you think?
Seems similar to https://github.com/tarsius/paren-face I use paren-face, and agree with this image https://github.com/tarsius/paren-face/blob/main/parentheses.png?raw=true So my personal approach is make all delimiters dim enough that they don't get in the way, visually, although they're still there if I need to Your approach seems different - if that's better for your tastes, all the power to you!
This just popped on my feed: https://github.com/positron-solutions/ragmacs/tree/master Looks very cool for emacs AI coding