I'd think not, if you look at the side-view curvature of the nose area behind the radome, there's really no way to accomodate a longer radome without looking discontinuous.
Honestly, the more I stare at the fighter mode, the nose really isn't THAT much shorter proportionally than the 1/48. It's the bigger re-shaped intakes that give the overall illusion of shortness/stubbiness. It's the price we pay to eliminate the low-hanging shoulder syndrome, I guess.