Hello,
Please accept my apologies for the delayed response.
I do recommend using the Safety outputs pins. They are provided to keep the system in a safe state until the microcontroller acknowledges it is safe to start normal operation, or when a fault is present. When a fault is present, these outputs prevent the system from entering an unsafe state.
Have you considered using the RSTB pin?
The RSTB pin is provided to inform the microcontroller that system power supplies are up and in regulation regardless of the results of the ABIST. A configurable watchdog counter is included to ensure the microcontroller is able to communicate with the FS26, which can react to any failure condition and place the system in a safe state.

Regards,
David