I think it would be amazing if we could have a death knight Arthas with the Lich King’s armor. It kind of restores the lore of Warcraft 3 in heroes of the storm and it would awesome to have his sound the same as crown prince Arthas. I believe Arthas’ fans will love this. Besides, I don’t think this whole procedure is hard since the two models already exist, it’s just a matter of combining them together or just taking the Lich King’s crown off 
So basically just grey recolour for crown prince skin -_-