To add a reasonably economical compensator to your 75SA you'd need to start with an extended, threaded barrel. Bar-Sto is the only company that comes to mind. Their barrels are $200+ with insane lead times.
It may be possible to get a 9mm Champion barrel and compensator from CZ-USA. It may not be cheap but I believe it would drop into the slide on your 75SA. A call to Mike at CZ-USA will confirm or deny this.
Assuming you can get your hands on a threaded barrel, there are lots of 1911 gunsmiths who will build you a custom comp. Speaking ecnomically though, I would try to get your hands on an EAA comp making sure the threads match your barrel.
Good luck,