Everyone who is looking for answers on this subject, can now calm down. It works. Everything works. Bungie didn't give you an answer, but here I am to give it to you.
I have played Destiny since it came out a year ago. I've bought all the DLC with my US account, and played with my EU account. Including TTK and all it's content. CE upgrade and everything. All the DLC works. I don't know if it will work more than once on more accounts, but it works at least once.
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I have two acct. One US and another Brazilian. I started to play on my US acct, because I was living there. Then, I bought my DLC I on my US acct and the DLC II on my Brazilian acct, because I'm not living there anymore. Now, I can't buy TTK because I don't have both DLC in the same acct. There is something I can do to buy and play TTK? Or Bungie won't let me play anymore. It's not fair to pay twice for the same thing..