All this actually stemmed from a random curiosity, but that's how I found this forum, and how most of my projects begin.
I agree on the shearing; I've actually turned to looking at counter top centrifuges. It seems these are designed for very small volumes of liquid, but it is possible that a slightly scaled up version could be of use.. maybe just a quart at a time as opposed to the largest capacity I've found for the $200 range - 150ml.. roughly 0.04gal.
So, instead of using centrifugal filtering, which could damage the molecular structure and compromise the quality of the sake, if we instead look at using centripetal force.
At a radius of around 9in, based on 3450rpm, the simulated gravitational force should be in the neighborhood of 3,047x earth's gravity.
That means that even at this relatively low rpm, the settling process could be done instead of in two weeks, in around 7 minutes. Keep in mind that would only be for what ever quantity that will fit in the centrifuge at a time, so this process could have to be repeated several times to settle an entire batch.
I have an idea for a fairly simple design in mind.. I have to round up a few parts (such as a motor). I may have a salvaged one lined up from an old HVAC unit.. Beyond that it should just be some pvc, an old used tire (as a protective shroud) some pvc pipe stuff, all thread, bearings, and a couple boards =)
Definitely not science lab quality, but should be fairly cheap to make and a fun experiment!