Revolvers would be higher on my list if I had any DAO trigger experience. My only double action trigger training so far is the DA part of my DA/SA triggers, and most of those are about 10 lbs.
Heavier DAO triggers and pocket guns pretty much go together. The nice thing about a revolver is that a gun smith can smooth it out. Another option would be a Smith 638 with a shrouded hammer. You would at least then be able to cock the hammer for a deliberate single action shot.
If single action trigger is what you want how about a Sig P238?