Ahh. OK I repartitioned/formatted, reform-migrate to the nvme worked except reform-boot-config, which complained about /boot still mounted from the SD card. So I manually unmounted it, reform-boot-config completed. And I can boot the machine and pop out the SD card so it’s working correctly…ish.
Now, /boot is on the SD card, / is on nvme0n1p1. This is acceptable to me for now until I migrate to the internal memory; will it cause me future trouble?
Any idea where SD card images are to be found? Tried the manual, which refers to https://mnt.re/system-image which 404’s. No other refernce to boot media image found in Documentation.