If If you can find one you may want to check one of the early 2kX 520's. There were a couple years of those that ran 1" threadless.
There's also a Tange cross/touring fork which is available in 1" threadless you may want to check out. Of note - I'm fairly sure it only has eyelets on one side unlike the Trek fork which would have both. This could be significant if your rack wants both.