We’ve had more than a few threads, even fairly recently about the H&R Young America, but I’ll go ahead and mention it here as well. If what you want is a gun roughly the size of the .22WMR NAA revolver but with a double action trigger, you really can’t do better than this turn of the last century “suicide special”.
H&R also made a very similar gun with a minuscule stub of a 1” barrel called the vest pocket, which would be more like the length of the .22lr NAA revolvers, however that version is much less common. You could probably find a functional example of the Y.A. on gunbroker for <$200 even these days.
I believe with modern materials this gun could be remade with a few improvements and would at least make a better defensive weapon than the NAA guns which have themselves been used successfully by people as defensive tools.