Turns out this is well documented here https://wiki.radxa.com/Rock3/install/spi
I have a working SPI image now that detects the other SSD and boots from it.
The Linux on the SSD doesn’t like things so much, but that’s different problem xD
If anyone is interested here is the SPI image rock-5b-spi-image_pcie2x2.img.zip (698.4 KB)
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