After all this time and much discussion regarding thrust blocks inside drum brake centersections, I thought a swap would involve pulling the diff and removing the block, but apparently the axles are both the same exact length and all that is required are the parts from a donor axle. NICE!
Nissannut from nissan4wheelers has done the swap and shows you how...on a HB pickup. It'd be way easier on a Pathy, you'd just need the disc e-brake cables instead of modifying the HB e-brake setup. Include a new disc brake master cylinder with the swap and you're done with minimal fuss.
http://nissannut.com/projects/H233b_disc_brakes/