Wish I knew a good suspension fork for a front hub. You want steel, but only crappy 40mm travel 1" steer tube ones seem avaliable.
Surly makes the best non suspension forks, but most mtb and bmx type rigid forks are quite adequate, with dropouts desinged to also support footpegs or land big drops.
We need motors designed like the Henizmanns, with round axles and an integrated torque arm. Till then, look for steel, and lots of it around the dropouts. I would think a professional welder could put some custom made dropouts on a steel fork.