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Well, Lemmy generally doesn't use much custom CSS outside of the standard Bootstrap 5 stuff, so writing one isn't too crazy.

You might find something here that floats your boat (you need the stylus extension): https://userstyles.world/search?q=lemmy (you might need to adjust on which pages these styles apply tho)

Have you tried customizing the compact layout to look like old.reddit?

- https://programming.dev/post/135335

- https://github.com/soundjester/lemmy_monkey

Better chance than Reddit keeping old.reddit for another 2 years.

Also, with a non-hostile API, it's very much possible for somene to design such an interface

Have you tried kbin?