The swordmage could be the arcane paladin or ranger. Half caster and then go from there. Maybe having a generic half caster with subclasses for paladin, ranger and swordmage could work. Depends on how much weight subclasses are allowed to have. I think, they might get a bigger design space for all classes. And start at level 1.Heh, I understand what you mean about the wizard, but I'm just a huge fan of the 4e Swordmage. No 5e gish is even close to how good of a gish the Swordmage was, even after they re-introduced a few of its signature abilities, like Booming Blade.