In that scale, no, I don't know where you can find commercially-available, ready-made handrails, in 1/32 scale, like you can find photo-etched rails in much smaller scales.
I have seen model boats in that scale, made to be used with 54mm figures, like a Nile gunboat, and the builders have scratch-built the rails. Most commonly, the modeler will make the stanchions from something like thick-gauge wire, or even thin nails or brads. And he will use wire or even chain to make the horizontal rails.
You can examples of such builds over at the Treefrog Toy Soldier Forum, to illustrate.
Prost!
Brad