I wouldn't use the reverse hook kick on the street. First off it is a head level technique that you turn your back to your attacker.
The traditional Ushiro-geri done at waist level and lower is safer. There are many other techniques that keep you facing the bad guy.
As far as what to use on a "non-threatening" individual...
If he's non-threatening why are you throwing down in the first place?
just some thoughts, Mark