Hi Aimee,
Sorry your original topic sat around a while and happy people have seen it now. I'm planning something a bit similar sans animals.
We've got a community garden with about 70 tiny allotments (25m2 each). No animals and no woody perennials allowed. We're planning to start using some household organic waste separately from our current garden waste hot composting cycle as an experiment. With the household waste, we'd like to end up producing a decent amount of our own worm castings.
We feel we need to continue hot composting the garden waste to sterilize -- everyone here grows tomatoes (of
course) and in our area, every plant is dependably infected with late blight at then end of every season, so we need to kill the spores to give next year's tomatoes a fighting chance. I imagine bokashi fermenting might do that but I don't know, so for the moment the garden waste will continue on its separate path.
In any case, the amount of garden waste we produce and hot compost is not anywhere near enough for all of our soil amendment needs, so we're hoping that our experiment goes well and we can incorporate the organic waste of a good number of households to our system and end up with a good amount of lovely, EM-rich worm castings for our allotments.
So, separate from our present garden composting cycle, we are planning to have a few bokashi bins in various stages of fermentation. Alongside will be a vermicomposting system hopefully a bit like
this.
We may be getting a shredder soon, so we plan to just mix about half bokashi with half shredded
hay or
cardboard or paper waste, whatever we have on hand. Sorry I can't find where at the moment, but as another poster or two noted above, I've heard that worms absolutely go wild over bokashi-fermented waste IF it's mixed up a bit with traditional dry stuff. There is not a lot of information out there about bokashi+worms so I really don't know the "right" ratio of dry stuff like your hemp bedding to bokashi, but we'll start with 50-50 and then observe.
Btw, I don't know how much "manure" your guinea pigs produce, but in any case I'm sure that gives a great extra nutrient kick to your finished product! Lucky you!