I mean, I'm not sure I'd call any build 'elite' when its description involves "Your mates will have to carry you levels 1-3, at level 4 you'll be pretty sweet, then at level 5-7 you'll be about as comparable as any other purely directed caster doing similar things, while at level 8 and beyond you'll be utterly gimped and crutched compared to your companions who, by that point, have 18 or above in their core stat, while you have to keep a particular helmet welded to your head for all time, in order to be just slightly *worse* than them."
I mean imagine twinning a Scorching Ray with Hex applied to target for 18D6 damage!
You can't. That's not how Twin Spell works.