> don't know of any other language that could be molded to accomplish the same feat.

This kind of stuff is the bread and butter of Racket. For example Racket comes bundled with an implementation of Algol 60 that lets you write Algol in your Racket programs. https://docs.racket-lang.org/algol60/

There's two implementations of Javascript https://docs.racket-lang.org/ecmascript/index.html and https://docs.racket-lang.org/javascript/intro.html, an implementation of Forth https://docs.racket-lang.org/forth/index.html and a lot more.