Here is a link to one company offering the Surly fork ... $94
http://www.bikeparts.com/search_resu...p?ID=BPC312274
I am not positive whether the outer diameters of a 1" threaded and 1" thread-
less steering tube are exactly the same, but I really do think it could be threaded for you to maintain the traditional look of the bike. _ Park and VAR Tools both make [made?] tools for this, and I suspect any frame builder could do the job - which should take only a few minutes of labor. _ Possibly even a local bike shop... one with an experienced old-time mechanic.
Failing this, Tange still makes
Threaded 1" replacement "Hybrid" CroMoly forks for 700c wheels... with canti bosses and eyelets ... and with fully chromed finish. _ On the down side, these are the cheap looking modern unicrown wishbone-look forks.
I have a VAR threader myself

... but, unfortunately only a die for French threaded steerers.

Sorry.