@njhaley I think the solution that you’re looking for already exists in the Flex Daily setup. Several of us on this forum are running it in Phoenix, and after getting things dialed in you’ll find that it’s quite intelligent, even for drip.
You need to first get your soil defined properly, and your vegetation type of course, including your root depth. Once you have that all set, you just need to define a custom flow rate for your drip setup. This post shows you how to go about that.
Let me know if your have questions.