I'm a southpaw as well........
& I love my 1911s ( I have 5). I have ambi-safeties on all of them.
I have also found that in some respects the 1911 is very good for left-handers. I use my trigger finger to operate the mag release & slide release. Us lefties do NOT have to shift the gun in our hand when reaching for the mag release, like most righties do. (Try it for yourself.)
Also, when clearing a loaded 1911, lefties don't have to drop the round out of the barrel & onto the ground. Since the ejection port is on the right side, lefties can just grap the slide forward of the ejection port (forward slide serrations are a good option), rack the slide back & the bullet lands in your hand & not on the ground.
as a side note....Colt designed the Peacemaker for lefties. Why do you think the loading gate is on the right side of the gun? Sam Colt was a Southpaw. For those who handle a single-action revolver, if right handed, you switch the gun from you right to the left for reloading. Us lefties leave the gun in our left hand, operate the gate & ejection rod with our right hand. That way the gun never leaves our shooting hand.:smile: