Hello,
Unfortunately, CodeWarrior only supports our microcontrollers. There is no direct support for using the ARM cortex, and there is no direct support of the cortex M4 in CodeWarrior or even support of the i.MX8M. What I suggested you use the SDK, is because we do have an example of how to initialize the core and it will be easier for you to use the M4 cortex. Otherwise, we cannot support another IDE different from IAR and GCC ARM embedded.
Furthermore, the CodeWarrior version that supports Coldfire does not have support for the ARM cortex. What can you do is migrate to the latest CodeWarrior version and migrate your whole project. However, we cannot support this, and we cannot guarantee if this will work. You can go with professional service support, probably the could help you. I apologize for the inconveniences this could give you.
Best regards,
Diego.