Thanks for the question. At the moment Breww can’t really handle this very well, to be completely honest. As you say, you can go down the line of “pretending” they are tracked containers, but it’s doesn’t really get you to where you need to be in the end.
We’ve had a separate feature request for something which I think will cover what you’re looking for here. It’s worth checking that out, voting for it (that’s a major factor in our prioritisation process) and adding any other comments and suggestions that you think would be helpful to make sure that what we build covers what you need.
The feature request can be found at:
Cheers 