Any idea why is it not a thing? Is this level of interop not practical for some reason?
I say this, having written a "95%" Common Lisp for Emacs (still a toy), and successfully ran an old Maclisp compiler and assembler in Common Lisp.
https://github.com/larsbrinkhoff/emacs-cl
https://github.com/PDP-6/ITS-138/blob/master/tools/maclisp.l...