You should be fine, I can't see how the ramping and tooth shape of a front chain-set is going to be affected positively or negatively by having or not having yaw. Companies usually have A B C compatibility and of course a yaw FD will give you SRAM's A compatibility and that's what they want you to use but if you're not in the position to afford or don't want to spend the money on the yaw FD I'd just proceed without it. If you have chronic shift issues that can't be alleviated by adjustment, then consider it. I could be wrong but from my understanding and first hand experience with working on SRAM Red 2.0, the yaw has more affect on chain rub during cross chaining than anything else.