I had been thinking about the above for some time, hesitating to post about it actually!
Then I cam across this in the NABU discord from Les Bird:
"All, I have RomWBW Option Cards on eBay for the NABU for those that want one. Fully assembled units with an F18A on a Tang Nano 9K and a compact flash card with a variety of CP/M based operating systems (CP/M 2.2, 3 and ZSDOS to name a few). Just plug and play. No modifications to the motherboard or custom ROMs needed. One jumper on the card switches back to NABU mode with the ROM still on the motherboard. Link here:
https://www.ebay.com/itm/276472634917 and details here:
https://github.com/sebhc/sebhc/wiki/NABU#nabu-romwbw-option-card .. it is by far the best way to use your NABU PC. Boot to the CP/M prompt in less than 5 seconds from the included compact flash. Gerbers and schematics on the Github for those that want to build their own."
Cool! Just what the doctor ordered - for me - I ordered one of Les's pre-built units. Manual build is a bit beyond my inclination presently! Think its going to be a great solution.
I was looking at the x16 or Agon for a "current" hardware - modern 8bit - option! But given the NABU is "literally" still a new machine this is a great option I think? My current option for disk based CP/M is a TRS-80 4P but it too - like me - "is getting old".