Tone Arm for Miyajima Zero

That cartridge is a beast for sure. I would put it in a 4 Point 14 which will fit in the same area as a 12" arm. I can not think of a better tank of a tonearm

If you have a solid plinth w/o a removable arm board you can make a tonearm board out of a heavy wood like cocobolo, lignum vitae or Ebony and overlay the old hole. You can also plug the old hole with like or contrasting wood and epoxy then plane it perfectly flat.
The FR is a good arm for it. IMHO the 4 Point 14 has better bearings and is stiffer. The SME V 12  is too light.