I have Modernist Cusine at Home, but not the original.
In any case, I tried the sous vide soy milk using the following approach
Soak beans over night in water
Grind bean in blender
vacuum seal
let bean slurry sit in the fridge
Cook bean slurry at 185 for 2 hours
Chill in water bath
squeeze out soy milk
Secondary boil
Preliminary observations:
So far, the best thing about this is the ease of dropping the temperature of the bean slurry from very hot to cold.
The blender whips a lot of air into the bean slurry. Even if this is cold, it still behaves as if it is boiling over. You really want to let things sit for a while before running it through the chamber vacuum. (Alternatively, put a small amount in a big bowl, evacuate the chamber, and bleed off the air before trying to seal it into a bag.