Text encrypted with key1, key1 encrypted with key2, meaningful?
Just two ideas:


If you have some kind of hardware security module (HSM) to protect your K_Azure you might want to avoid using that HSM to encrypt large volumes of data. But since you cannot get the K_Azure out you generate a new key and use that.
If you don't have other randomization in your AES mode you will leak equality information if you use the same key for the same data.