I think that I am in a similar situation myself. I want to add CAN/J1939 support to a TI RM46 HDK build of FreeRTOS 9.0, and I am not correctly seeing receive/transmit CAN interrupt behavior (the communication network wiring is vetted), but my ISR setup might be lacking.
I would prefer to avoid doing a fresh build from HalCoGen.
These are the goals: target of RM46 HDK, use FreeRTOS 9.0, use CCS 5.4 IDE, use Simma SDK where possible.