>>...Changing to a different pistol or to a revolver is not going to change the possiblity of having to manipulate a gun with only one hand...<<<
No. It wouldn't BUT (and this is a very important 'but') nor would it require that the person to have to manipulate ANY controls other than trigger and perhaps a manual safety....ready for what might be the proverbial '..life and death..' situation.
If you're trying to affix something with a screw, the proper tool to use is a screwdriver...not a hammer. If you feel compelled to carry a firearm for personal protection...then it should be the proper firearm for you...ready to use as circumstances arise.
I can just hear the villain now:
"..I'm sorry to have awakened you, sir, when I broke into your home That was not my intention, I can assure you. I only broke a small window in a back door in the process of the break-in which must have disturbed your sleep. I was doing my best to be stealthy...but you know, these things happen. Please accept my apologies for the disturbance. I can see that you're having difficulty preparing your pistol. May I suggest that you use the edge of your nightstand to rack the slide, chamber a round and cock the hammer.. It's dark in here, sir.. Would you like me to turn on a light so that you can see better? We wouldn't want any untoward accident to happen during the commission of this crime. Dear me, no !! I can wait to continue the robbery until you're properly prepared...I'm in no hurry...Just let me know when you're ready, sir..".
It's odd that no one has suggested that under the condition described the simplest solution to the problem is that the person simply carry or keep their single action Hi Power in Condition 1--round in the chamber, hammer cocked, safety on....or Condition 2--round in the chamber, hammer down.
Employing outside devices or methods to make the firearm '..ready..' for use is at least silly....and potentially dangerous.