Why would you not buy SA? I'm not in a role where I buy licenses myself, but my understanding is that the benefits of SA are worth all the money.
As for the question as such, this is a technical forum and your question is of a legal nature. You cannot get an authoritative answer here. You are better off talking with your local Microsoft representative.
A standard answer to licensing questions is: Call (1-800-426-9400), Monday through Friday, 6:00 AM to 6:00 PM PST to speak directly to Microsoft licensing specialist.