I think your effort organize your information is great. I do wish you best with that.
You have a point with your ball mill. And I have checked out the links you gave. Further it does not seem to be an overwhelming task to make one, apart from I need to swipe a motor from somewhere ....
But I am thinking. I don't want to play with more than 1 g mass at the time. It must be a miniature ball mill for to not have the small particle plastered all over the inner surface of the drum, and on the balls by static, and hard to extract. I suspect it should be under some inert atmosphere too. I would prefer to handle my powders inside the glove box (I have the bake oven outside, but I intend to not make any more concessions in that respects). I have a hard time seeing a ball mix be housed in my box, especially since it is already crowded in the volume where I have a fair reach.
BUT: One could imagine a solution with steel balls from a very small bearing, an SS cylinder which can be sealed airtight, in which the 1 g powder is placed, together with the bearing balls, inside the glove box. This SS cylinder is then brought outside into a small tumbler, perhaps a small DC motor, driving a coke can, low mass low inertia, that has been opened up in one end. The tumbler and the SS cylinder would look like a high-energy ball mill solution, although maybe not quite the same. Possibly.
I agree in general, but it is not for me. Not presently. But the thought has been seeded.
Thanks.