Is there a meta-library someone somewhere has already written for when I just want to write 20% of a compiler, and it more or less takes care for me 80% of the common compiler-building-related things I’m likely to need to do?
Racket at least provides most of the tooling required (eg dealing with details of namespacing, syntax, runtime/compile-time/evaluate-time distinction, continuations and garbage collection), but if you've ever tried to introduce it into an organization of significant size this very same result of yak-shaving will be considered a liability.
And you can step up a level above in the same ecosystem as well, my current project is written in Scala and directly shares its data structures with the Graal Python interprer that I've embedded inside it, so other people can write the stuff they want in Python.