Welcome! Nice to have you. How did you find out about us?
I like this plan and would enjoy writing the outcomes. Note one small technical problem: macerators store 'one object', which is a term that causes you to tear your hair out when experimenting, since it seems to be very fuzzy and not even always consistent. The 'object' must be touching the seal. A pile of grain sitting on the seal will probably count as a single object...unless the pile is too high, in which case it won't. Or if the moon is in the wrong quadrant, or, or, or...
Regardless, a bag or box generally counts as one 'object' so long as it fits the mass and volume restrictions, so you could put the grain in a container...but if you do then you're grinding the container up with the grain.