Did OP say if this fork was from a crummy bike with a heavy fork? That would change my answer a little.

Drilling a hole in a fork is nothing like using lightweight blades as far as the likelihood that dangerous fatigue failures will result. Lightweight fork blades are much safer than a fork with holes drilled in the blades. You don't have to know much about fatigue failure to know that. Nobody (except the people that designed the CE bike tests) care about what happens to a fork in a crash. It's not an airplane.