Hello,
Thank you for using the NXP community.
I do recommend reviewing the S32K3 evaluations boards as a reference for your design.
As you noticed, all the solutions include a Safety SBCs (FS26) which is highly recommended to supply your MCU. The SBC or PMIC performs observations and control functionalities that are essential to fulfill some related functional safety requirements.

I hope this information helps.
Regards,
David