We run incapacitation drills at work to give us an idea of what to expect should one arm or the other become injured. It can be done. Two main things I would suggest you look for is a tall rear sight and a prominent or extended slide release.
We use the rear sight to hook on boot soles/heels, holsters, belts, pockets, wall corners, counter/bench tops & legs. Hook the rear sight on what's safetst and most available and push the frame forward, then you can use the slide release to lock it to the rear. Much caution and muzzle discipline must be used, and some forewarning to the range control folks would be a good idear. If they're of much salt, they'll likely watch you for a bit to make sure you can safely occupy your lane then just leave you to your business.
As much as I like the Sig, I really can't put those on the top of the list of suggestions. I do however think the CZ's, EAA's, Baby Eagles, Bersa Thunder line is a good place to start your search. They are all available in compacts, tall squared rear sights, and slide releases that afford good contact area. At first, you may have to lay the pistol down on a table to swap clips- but in time you'll learn to work things out your own way.
Suggesting you go with a revolver IS a good suggestion, however it just don't seem right to tell someone to adapt to a limitation when they clearly have the mindset to excell with a limitation.
I saw a video of a guy with no arms run a 1911 quite well, including reloads. And I used to work with a gentleman at the VA who's left arm was pretty much left useless in Vietnam- I hated shooting next to that guy! He was plaenty safe, but the problem was that he shot circles around me and left me darn little room for excuses. Anyway, persue what you want and don't let anyone hold you back.