If mixing and matching SRAM and Shimano didn't work then how on earth would aftermarket brake calipers like ee work well with both manufacturer's levers? You really need to engage your brain before uttering such misleading nonsense. If you think that mismatched groupsets look ugly, that's fine, and you're entitled to that opinion, but to suggest that they don't work is plain wrong.
Thousands of people including me use Shimano calipers with SRAM groupsets becuase they prefer SRAM shifting and lighter weight but recognise Shimano make better, stronger less hassle brake calipers.
Cable pull ratio is only for not mixing MTB V-brakes and road brake levers or gear shifting.
To the OP: Yes use Dura-Ace calipers with SRAM levers on the whole work very well together but be careful with unusually wide rims as that can potentially cause problems and check that you're happy with the feel of the brakes. Some people really like an early brake bite, others like a very long modulation with a bite close to the end of the lever travel. There is only a certain amount that can be dialled in or out with setup so make sure you're happy with things before you spend money if possible, but this goes for other aftermarket brakes calipers like ee.