Don't quote me on this, this is just some arm chair mechanicing lol. But I would think you could used the master cyl for a 123 and route the line to the slave cyl for the Toyota trans as long as the slave cylinders are the same diameter. as long as the volume of fluid being pumped form the 123 master is what the Toyota slave wants then we're ok. and we can check that by calculating the volume of the 2 slave cylinders. I have a 123 slave on my shelf and I can get a Toyota slave from the junk yard this weekend.

I've been thinking about the drive shaft. it is a slip yoke. you could modify the yoke to have the 3 fingered flange for the flex disk... the only think i see is that then you would have 2 slip joints. one on the newly built yoke and one where the drive shaft couples at the center bearing... maybe the solution to that is just to tack weld one of them... or maybe is not an issue at all. I don't know.

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