I rather like the Interlisp-D approach where while you edit in a live environment it then syncs the modified versions back out to lisp source files on disk as i

I rather like the Interlisp-D approach where while you edit in a live environment it then syncs the modified versions back out to lisp source files on disk as its standard/natural workflow. I suspect the way you're working with slimv is at least somewhat comparable in terms of making getting that part right the path of least resistance, which is itself a form of developer experience ergonomics.