Hi, John
On the CANBED FD the “SPI pinout” you have mentioned, it is accurately ICSP pinout, similarly on the Arduino UNO ICSP pinout which is meanly used for programming the MCU purpose, that’s why it shows RST, it can be also used as SPI, but you need to find anther pin to repurpose it to CS pin.
You can checkout this guide for reference:
And the CANBED FD schematic for reference: