While I'm sure you can get a high score using it, you really do need to know all of that stuff. Your time would be much better spent reading the Instrument Flying Handbook and Instrument Procedures Handbook a few times, then accepting that you won't get a perfect score. Also, I can assure you, your DPE will know within 5 minutes into an oral exam that you didn't get a 97 on that written exam because of your knowledge.
By all means, use SA for something pointless, like the ATP written. But you can pass the instrument written exams the old fashioned way - by actually understanding the material.