I wonder if level 14 could be "you may use your bonus action to make an attack with a ranged weapon".

This limits the spellcasting to cantrips - lessening the two levelled spells per round risk but also allows a LOT of versatility. Disengage and shoot an arrow/spell, dash and shoot an arrow/spell - it almost becomes like cunning action provided one of the things you want to do is shoot an arrow. Good for the class fantasy of a dexterous mobile sorcerous archer.

Also I get it's called arcane archer, but relaxing this a bit could open up some fun options - dwarf sorcerers throwing axes for example.