"Series" as a hierachical item

I used the "Look and Feel" config of "Categories with hierarchical items" to set "series" that way. My intention was to be able to deal with multiple series set in the same universe, where the series need to be read interleaved to keep continuity.

So, I set books to:I expected to be able to sort by series so that it came out like the above. Instead, it does:Is there any way to use just the series column to get the overall reading order sort correct and to also easily keep track of the separate series? I know I can create another column, but since only about 2% of books in my library need this, I'm trying to avoid that.