Done It - No More FOMO
Added Raspberry Pi M.2 Hat+ to my Pi5 running Pi OS Trixie and rpi-cloned/raspi-config'd it to boot from the NVME SSD.
I can still backup the SSD to the SD Card for a while, but I guess eventually I'm going to have to backup to my 256GB USB stick.
This is a dry run for eventual NVME SSD boot for TB5-WaLI robot.