It turned out to be a problem with UEFI. I started making headway when I discovered that F10 allowed me to boot into everything except the SSD, but I could still boot off the SSD if I chose the UEFI option. Then it was a matter of using diskpart, bootrec, bcdboot and bcdedit.
Not sure what caused the problem, but happy to be able to resolve it.
I am happy to hear you resolved the problem.