A possibility could be to offer an A330-xxx with more capacity, leaving the longer ranges to the A345/A346.
But I doubt, this would work. A longer A330 with the A346-wing would certainly need a new engine, which might get bigger, than the ones currently used. At firt impresion, the ground clearance (engine-ground) could be very low. The clearance of the Trent 553/556 used on the A345/A346 is already very small.
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