JAR - Yes you can poly first then past wax NP! Also to save some work when buffing your carnauba wax try using a DA polisher if you have one it can help save a lot of time and effort, carefully with a clean pad on place a microfiber cloth across the pad holding on to the corner and use the polisher to help buff away, saves a lot of elbow grease
I am addicted to detailing and love it freshly waxed .............anything freshly waxed really