I am very skeptical of a grip switch for a light or a laser. In a night time defensive scenario, when a deadly assault is more likely to happen, I wouldn't want to have to beacon myself just to grip the pistol properly.

I have a similar size pistol, and chose to use the Streamlight TLR-6. It's not as good as it could be, but it makes the most sense out of the light options on the market for microcompact carry pistols.