Hi Alex Colpitts
I would not recommend to take processor expert code and put it into a baremetal project, it would be difficult to find all the APIs and drivers that are managed by Processor Expert. It would get more complicated if you are using processor expert with KSDK1.3.
My recommendation is to check MCUXpresso SDK 2.x drivers, those drivers have fewer layers and can be easily used as a reference for a Baremetal project.
Welcome | MCUXpresso SDK Builder
Hope this could help
Best regards
Jorge Alcala