The reason why this could work in the UK is because college admissions there are strictly a numbers game. You don’t have the numbers, then you won’t get in. There are of course a few exceptions. The UK uni’s don’t care about your trumpet skills, unless you plan to study music. They don’t care about your volunteer work in the hospital unless you are going to study medicine. I think this is a good idea, but I can’t see it working here, because as someone earlier said, your ECs will be a dead giveaway, for,the most part. And gender anonymity is NEVER going to,happen at the most selective schools.