What if they just didn't acknowledge it? I know it sounds like a cop-out but, when I first saw Psylocke/read a comic with her in it, I had no idea she was Asian even though I'm Asian myself. It's like "She uses martial arts!", yeah, like a dozen and one other marvel characters including Electra. "She LOOKS Asian." Yeah, not to an actual Asian. Her hair is purple. Her eye shape don't look different from, like Gambit or wolverine in some shots. To me, it looks like someone draw any other thin, athletic woman character (of which there are many in Marvel comics) and put long purple hair on her.
If nothing about her personality is Asian and she doesn't actually look Asian, then why not just say she's not Asian?