Is there some reason you don't want or can't get a Florida concealed weapons permit? It's a "shall issue" State and the requirements aren't very onerous.
The best choice is to get the permit and a modern handgun. There are any number of suitable, small revolves, include several small frame revolvers made by Smith & Wesson.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper