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@rpm
well they look OK for drilling, I have seen grooved crowns like that drilled before.
the problem would be brake caliper drop..
you need to put a wheel in, and measure directly from that groove in the crown to the braking surface of the rim.
If that is within the realms of your caliper's adjustment, or any short-reach caliper's range then you should be OK.
It's also worth dropping into see a frame builder (or knowledgeable shop) to confirm they are safe to drill!