So let's say a druid casts flame blade and then wildshapes?
-I am guessing weapon enchantments have their enchantments shifted to available natural attacks as an absorbed magic item with a constant effect.
-Flame blade creates a wielded magic item with properties.
*If those are true, you have a natural attack that acts kind of like the flame blade spell in some ways.
*Otherwise, the flame blade is ineffectively absorbed.
*Or, you now have a flame blade wielding badger.