shutnlar- Benelli and Fabarm both make LH semi-autos, as did Winchester in the 1400.
There are very few people out there that a completely neutral stock will fit correctly, right handers or left handers. Why do you think a lot of people who can afford to do so, have a custom stock made, or shoot a precision fit stock? It isn't to flush money down the drain. If you have a neutral stock, and "think" it fits you, I suggest you see a competent stock fitter, as you are probably wrong. The only way you could shoot a neutral stock, and have your eyes level on the X axis would be to have a razor thin comb, and eyes that were very far apart.
And no, an adjustable comb and adjustable pad CANNOT get you the same effect as true offset and toe out built into a stock, otherwise everyone whos ever had a custom stock made would just be shooting factory stocks with adjustable combs and pads. I shoot a comb thats 1/2" offset from the centerline of the barrels. If I were to take a neutral stock, and move the comb over a half inch, my jaw would be bashed in by the comb cut every time I shot the gun.