Nick, for future:
I have a few second hand 48T 130BCD 5 bolt 3/32" chainrings - including Surly SS ones, when you wear the current one out. I changed my fixed transmissions to 1/8" throughout and external BB.
Sprocket removal in theory requires a special tool, however a suitably large/thick open ended spanner in a vice works fine in my experience, once the axle is out of the way.
Wheel bearings are sealed cartridge type - readily available. If using as a shit weather commuter replace with SS ones when they go rotten, try to get to them before the cages inside explode which does make getting the outer shell out of the hub more interesting but do able with special tooling (which I do have).
The track nuts will start to rot from the inner surfaces - soaking in waxoil before they go brown will help prevent the rot.