You're right to be iffy about the tie if you're going for a neo-victorian/steam look. It's a very modern tie. On the other hand, it makes a nice modern look. For NV/Steam, a plain black tie would match your pants and be nicely understated. The colour on your waistcoat is striking enough (and suits you), but if you want someting else that stands out, a gear pin on the waistcoat, or tie-bar would work.