Find sights that work for you and get them. The trigger mods for an SD pistol carries "more" than just a "tweaked" trigger. God forbid any of us have to use a firearm in an SD situation.
With that being said, every instructor, training program, etc,....stipulates "What happens after the shooting?"
Well,
You will be investigated six ways from Sunday. The firearm may be kept as evidence and examined. If the BG survives, or the family sues you in civil court, the DA, or ambulance chasing lawyer, is going to love the chance to provide a jury the info about your happy "hair trigger" modification.
We all know this is BS, but never think it doesn't happen.
My G21, is due for some night sights also. For a tourney/comp gun, I say all the tweaks and mods the better. For a carry gun, less is more.
My humble .02 cents.