I think that your concern may be much ado about nothing. Remember that the cylinder must turn to fire and that the trigger pull is really long even in a J frame. So I did an experiment with my unloaded 442 and a JMCK appendix holster. I was not wearing the holster, only testing to see if the trigger could be pulled on holstering. With my finger on the trigger it was a no-go. I then stuck a Zebra pen through the trigger guard because it's thinner than my fingers and it was a no-go. Next, I balled up enough t-shirt to fill in the trigger guard, but when I tried to jam it in the holster is started to force the kydex apart without pulling the trigger.