I have similar need, would like the ability to select all rows in a table and then only de-select the specific rows that I would like to exclude from the filter. At the moment you need to select row by row and that is very time consuming, especially, if the table contains many rows.
Idealy it will e great is we could select all rows using <Ctrl> A while the table is in focus.
I had a similar need to analyse voting patterns (I wanted to select those who made a particular choice at one election, and see what they voted at other elections).
In general it's quite frustrating than we can't CTRL + MAJ to select group of rows in a table or matrix and not having the CTRL + A for selecting all. I hope it will be added.
Eventually, I used the HierarchySlicer which can be found on the market place. Compare to the standard slicer, this one can be filtered by other visual. You need to add the select all option. Once you select all, you deselect whatever you selected in the first visual in the first place and voila!