I don't see making the powder to be as much of a challenge as would be containing it so that it didn't kill me.
So,let’s see: Suppose we started with a liquid suspension (used for vaccine research as I recall)and ran it through something essentially the same - although cruder - as the Niro machine. (How would the working parts of a Dyson vacuum cleaner do ?)
(Let’s also assume we did this “off post”,somewhere,and that we subsequently destroyed the processor used.)
Wouldn’t this tend to produce a batch that was of “uneven” quality (such as published reports suggested) ?