Here's my take: You should be able to pick up a Glock and use the same finger placement as you do with any other gun. If it doesn't hit where you want it to, don't go to the gun, make the gun come to you. If you don't, you become the gun's slave and have to take a special grip or finger placement for that gun. That action then, requires thought for every other gun you pick up.
Move the sights.