Um...: which begs the question why are you flying at night in a piston single anyway unless you have a death wish.
Plainly you have an agenda. What's the difference between a piston single at night and a turbine single ? Oh yes - there are fewer engine failures in pistons than turbines........
In the UK the R22 and R44 have an excellent certified night kit available which provides high intensity external lights for illuminating the ground if you need them. These are in addition to the 2 standard landing lights.
Funnily enough, if you evaluate all the risks for Day vs Night in a single you would probably find that the Day risks are more.
Like the Manchester Low Level corridor on a sunny, calm day when all the microlights take to the air over Cheshire and don't show up on radar - so the FIS is useless.
Night flying is a wonderful experience and makes you a better pilot. For that reason alone, we should all have a go at a night course.