While my choice of carry weapon may not (should not?) influence yours, I want to point out to you that even if you "don't intend to CCW on a regular basis," you still have to practice assiduously with whichever pistol you decide to carry.
If you expect to be able to quickly present your pistol, and to shoot it effectively once presented, you had better put in just as much practice as does any "24/7" concealed-weapon carrier. No matter how infrequently you carry a defensive weapon, you still need to develop the skills associated with using it responsibly.
In real fact, people who carry a weapon only once in a while are, more usually than not, the ones who have accidental discharges, who draw and fire inappropriately, who miss their targets but instead hit innocent bystanders, and who freeze-up in the face of a dangerous assaults.
Target shooting is not the same as CCW practice. For CCW, you need practice in shoot/no-shoot decision making; actual presentation, both shoot and no-shoot; and handling multiple targets at varying distances with both precision and smoothness.
By all means choose one, and only one, pistol to carry concealed and to practice with. Don't confuse yourself with trying to master several different trigger systems, barrel lengths, and grip shapes.
Good luck. Let us know how you're coming along.