Which Judo techniques are least likely to cause injury?

I recently got work as a security guard. My tokue-waza is o soto gari, but that has a really high risk of causing a concussion or breaking ribs if you do in on a hard surface. Hell, it's a concussion risk on tatami.

I want a throw that can easily transfer into osae-komi without high risk of serious injury. I was thinking harai-goshi, but I wanted to know what r/judo thought. Any suggestions?

EDIT: Bear in mind that I'm a pretty big guy (-100kg) so I can't really use techniques where I fall on top of my opponent.