Here is some context on Racket vs Gerbil by a well-known Common-lisp Programmer, François-René Rideau : https://fare.livejournal.com/188429.html
Looking around a bit, I came across a couple of implementations that might be of interest for those wanting to mash up "some kind of system programming" and "scheme": Bigloo (interpret / compile to executables, java byte code or experimentally dot.net) and larceny (interpret / direct compile to machine code / optionally via c):
Hop looks like one such project, I don't know if gerbil would be better as an underpinning than Bigloo?
is another good one - compiles to binary, many libraries (eggs)