Hi Andrew Parlane,
The baremetal code is the old code which is based on the register control, not the same format as the ongong SDK. It seems the nxp.com website remove that code package, but my side still have it, it is mainly CW and IAR project:


I have checked the 72Mhz with our SDK department in the previous time, seems no plan to update it.
As you know, the MCUXPresso IDE support also based on the SDK, so the MCUXpresso can't support your chip directly.
If you need the baremetal code, you can create a case from the nxp.com, then I will share it with you, as I can't share it directly in the public community.
This is the process how to create the case:
1. Open below SUPPORT site, click blue "Go to Tickets" in the middle.
http://www.nxp.com/support/support:SUPPORTHOME
2.Then you will be requested to Login, if you have no an account, please first Register with your business email.
3.After login, please "Create New Cases" button in the middle, then you can submit your question.
Sorry for the inconvenience we bring you.
But you still can refer to the baremetal code about the driver.
Best Regards,
Kerry
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