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

Glanz. 

Unfortunately I already have a mounting hole in my turntable which is 12 inches (305mm) from center of the hole to the center of the spindle and that distance is too long for both the Raven and the 4Point 14.

There is room for some play in the position of an arm within the monting hole but it's a metter of a few mm, not as much as 50mm (Raven) or 14mm ( 4 Point 14).  

However I will keep these suggestions in mind.

Fidelity-Research FR-64s with N60 stabilizer (or B-60 base) is the best you can get

There is room for some play in the position of an arm within the monting hole but it’s a metter of a few mm, not as much as 50mm (Raven) or 14mm ( 4 Point 14).

If I understand you correctly, that’s the measurement for the Raven 10.5 arm. There is a Raven 12 arm that is about 289mm but that may not be exact enough for your existing hole.