Left handedness in general is not h/c. I don't think many were made at all. I am a left handed shooter, but also always interested in historically correct flintlocks. Shooting r/h guns has never really bothered me, but over the years I have had a couple l/h guns.
Historically correct was always important to me, and the l/h guns just didn't make that much difference for my actual shooting that it out weighed the not h/c. To me it wasn't worth the cost of having a l/h gun just for shooting that I didn't consider h/c.
You should shoot some l/h flintlocks if you can and see how it is for you. Other left handed shooters have commented on other threads how awful shooting a r/h rifle is. They don't bother me at all. You should see where you fall on the spectrum.