Consider instead, a thumb break holster. Then you can carry properly, and no worries about the hammer dropping.And many of us old dinosaurs who've been carrying hammer down on a live round (the way JMB intended!) for over 40yrs , have been practicing cocking the hammer when we draw.
Or I'd just switch to a Glock. When a bullet zings within inches of your head, that adrenaline dump turns your reflex's into fumbles. Especially if you see the threat closing, and you're way, waaay behind now.
Even the weak, stress free, jitters, that I get at the beginning of a safe USPSA stage, prevent me from plating games with the hammer. Real stress? It would be a nightmare.