on my way down to the machine shop, we've run through some ideas, we might just drill out and re-tap the center rod and use grade 8 or 10.5 hardware. an8-10mm dia bolt in that strength has got to be as strong or stronger than the cast aluminum slag the bell-housing was made from.
i'll be taking pictures and everything. and when i do the clutch next time i might convert to push style, seems obvious why subaru changed once you look at the first picture, the force goes the other way. so to break it would have to split the whole housing.