Try brownells.
Have you asked any local FFLs to check with their distributors? Might be best to ask non-dealers. A dealer might just contact Stag directly like you did and leave it at that.
I hear you. I'm a lefty. Had to custom order my Stag 2L a few months back. Best of luck. Stay safe!
i shoot long guns left-handed - all of my bolt guns are lefties, but my ar15 and ar10s are all righties but i of course shoot them left handed. haven't caused any problems for me. the brass deflector keeps crap out of my face, and with the center charging handles, they work fine, and using my thumb to flick the safety on and off works good.