To start off, neither Trijicon, TRUGLO or Meprolight make night sights for the HSc.
Additionally, if you were to find a set, only the rear sight is dovetailed into the slide. The front sight is integral to the slide. You would have to find a custom maker to drill the front sight and install a tritium ampule, and I don’t believe there’s enough depth to do so.
The job, if possible would probably cost more tan the value of the pistol while ruining its collector value as Vlim has alluded.