I doubt it. To sell something in a 'hypermarket', you need lots and lots of advertising -- something GPH isn't even capable of, nevermind if they advertise enough or not. Joe Consumer doesn't want some odd Korean handheld that doesn't come with any real stateside support, he wants a Sony or...
Supercard has perfect NDS compatibility too. If you feel justified spending almost $30 more just for 10% better gameboy advance speed/compatibility, then go ahead.