I have a stock 1/8" threadless cro-moly fork, fit for an integrated headset. I want a fork that has mid-blade braze-ons for a front rack. I know I can use p-clips, but that seems a little "iffy". I'm also aware that some fork braze-ons don't line up with your rack of choice. Will this Soma work with an integrated headset? If not, is there other forks to choose from? If all else fails, I guess I can go to a frame builder.

Functionally, any "non-integrated" fork will work with an integrated headset/head tube. Integrated forks have wide shoulders which mounts flush with the flanged bottom of the head tube for a streamlined look.
A standard fork will work but may look funky under an integrated head tube. The only difference is aesthetics.

Thanks. The stock fork isn't as wide as say, a Alpha Q cross fork. Another thing to consider is the rake. Back to researching.

There's nothing iffy about p-clamps, they work fine.

Also, Old Man Mountain front racks can mount on the brake bosses. There might be a couple of other brands that do that as well.