I don't think there's any good reason to do a full curve (testing every 2 hours for 12 hours)....I was just suggesting that you go ahead and learn how to test, develop a good routine and figure out what works best for both you and your cat.
The actual usefulness of the numbers isn't really the issue....just getting both of you used to the process of testing (before starting on insulin when it's vital that you test every time you need to)
Having some "baseline" numbers is OK....it will give you an opportunity to know where you started so you know how far you've come, but you don't need to do an official "curve"