The original is a 10.9 (the metric equivalent of 8). Yes, I'll not go lower
than that. OTOH if the bolt were to be highly stressed again, I would
rather the bolt break than the female threads in the crank be damaged, so
I'm going to call the 10.9 optimal and not even consider a 12.9.
Considering the awkward location for drilling, I think I'll turn a bushing
on my lathe to keep the drill centered and straight. Just about any
material will work for a 1 shot tool. 1018 CRS machines easily.
Mine turned out easily with a screwdriver on the broken remains. Try it.
Good call on Omega. A used OE is the right bolt.
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