Pardon my ignorance, but NJS?
If it helps, my track fork which I drilled almost 50 years ago has a forged sloping crown, roughly 12-14mm tall, base to crown. I had to grind away some at the back of the brake bolt's block and even a bit off the washer in back to keep them clear of the crown race, but no big deal.
I'm sure it's crack one day, but in truth there's still more material than the transition between steerer and blades on either side.
As I said in my first post, folks drill these all the time, so if you do it right, you should be fine.
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