You can change your starting stats, abilities, talents, and skills. That already mostly allows you to do what you want.
If you want your battlemage to be a dual-wielder, look at the battlemage point allocation, select a fighter and copy the allocation over top. Presto, it's done. Want your Enchanter to wield a staff? Copy their stats and make an Inquisitor.
I don't think it really matters very much what element your "My Lousy Starting Wand" is because it does low damage and you shouldn't have it for long.
