It just feels dirty to me. Like, the headphones don't do bass well, trying to make them have better bass via EQ just seems wrong. Physically modding them to have better bass is another thing.
Its like asking a track and field olympian to hop on a football team and saying he'll be good beause they're both athletes - They just wear different equipment.
Maybe I'm just weird.
Should it feel anymore wrong or dirty than adjusting your TV settings to get the best picture possible? Although, I can understand people wanting their headphones to be self-contained, especially if your source varies constantly. But I think generally most people listen to a consistent source/setup for EQing to not really be a hassle.
And if a track and field olympian could adjust to playing football, why not? He might not be as good, but it's certainly better than the alternative of playing with one less person.