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I'm sure someone will correct me if I'm wrong, but the racks that attach down by the axle (eg Pelago, Metro etc) shouldn't be affected by the straightness of the fork. Mid-rack mounts such as the Pizza rack might give you more grief, but from what I can see there's still a bit of anterior/posterior adjustment in terms of the mid-fork mounting. Plus if you use P-clips that'll negate some of the issues with having a straight fork anyway.
As in, will the P-clips work with a straight Kona fork?