Think outside the box with hubs, you can use any kind of 36h hub from bitd, such as racing bike or track hubs. You will have to convert the axles from Q/R to solid (track) axle.
Look for names such as Normandy, Maillard, Sansin or Sunshine, Resilion, Sturmey Archer, Airlite etc etc.
I love hubs, they are my favourite part of a build.