I am right handed but left eye dominant. One of my uncles checked me before I went bird hunting with him and he said to use my left shoulder so that is what I do to this day. It would be hard to take a quick shot using my right eye. At this point nearly impossible.
I have a left handed 30-06 and a left handed 22lr and I like them. But on airguns I prefer to work the action with my right hand. I moved my Prod to the left and then moved it back. My Caiman X had it's lever on the left when it arrived and I moved it to the right. I tried an Impact once and couldn't see through the scope. My Mossberg shotgun throws the empties past my face but I don't see them. I am looking downfield. But I so not want the magazine of the gun in my face. Long guns I can shoot but I like bullpups. I like my Caiman but I really like my P35s and Bullshark. You cannot move the lever to the left on these SPA guns (by any reasonable methods, at least) but that does not bother me. Their stock magazines do not protrude from either side. The Carm extra capacity magazine I have sticks out about 3/4 inch into my face and I hate it. I do not use it. Maple makes a extra capacity magazine for P35s/Bullsharks that protrudes on the left. I have one (so far) and love it. I am talking to Bigair (do I have the name right? the guy in Kansas) about making one. Doesn't hurt to ask.
I prefer scopes with the illumination switch on the top at the rear. When it is near the parallax knob it is hard to reach and about impossible to see without taking the stock off my shoulder. I also would rather have the parallax be on the front of the scope where you rotate the whole end of the scope. Much easier to do for me.
The P35 safety is a feel thing for me. A tiny little button above the trigger. I'm used to it but it is not lefty friendly.
I do not like the very thin barrel of FX airguns but I refuse to buy any airgun that sticks a huge magazine right into my face. Not happening. SPA guns seem to be in general at least pretty lefty friendly. The big Zellos magazine is right in the middle of the gun. Protrudes the same on both sides I think.
My arms are so long and my hands are so big nothing fits me and I make my own stocks. But I can't fix a magazine in my face.