Slow Damage is the most grounded of N+C's (main) visual novels, so I'd say that the chances are, while not exactly zero, kind of unlikely especially since even in the tense moments, things aren't... frenetic or dynamic as in the other VNs. But then again, given that anything can be a stage play these days, we might just be surprised.

I actually think that Togainu no Chi may get a stage play in the future; the fact that it's got a lot of action sequences would work in stage play format, plus there's all the interpersonal drama between the characters (hence lots of acting for the cast). Given what they could get away with in the Sweet Pool stage play, while the stage play may understandably do away with the ickier scenes (and endings), they'll leave just enough that it won't feel robbed of its identity.