Most seemingly steampunk stuff I've seen around has been more magitech focused. The closest thing I've found to extraordinary "nonmagical" steamtech is Northern Crown: New World Adventure's Natural Philosopher. Basically like an early scientist/inventor who takes "degrees" in different domains of science/knowledge (e.g. Magnetism, Mentalism, Physics, Life and Death). Instead of casting spells, the natural philosopher creates Phenomena (which are Extraordinary abilities) with his apparati. Compared to spellcasters and their spells, though, each natural philosopher is very limited in selection of Phenomena. Think of each degree like a spell school; a 1st level natural philosopher starts with only two (but gains some more as he gains levels).
The apparati are not really modern take and have a bit of a rudimentary pseudosience or alchemical sort of archaic feel to them that seems to fit the flavor of the setting (a highly fantastic colonial America). The Magnetism degree uses a Galvanic Belt, for example. While most of it probably isn't steamtech per se, it might be useful inspiration for mechanics.