I use calibre only for conversion. I don't maintain my library with it. So for me, using a Plugboard to merge the series with the title when I Save to Disk works. I use the following:
Format: mobi
Device: save_to_disk
Source template: {series:|| }{series_index:0>2s|[|] - }{title}
Destination field: title
With this, "The Singing Sands" by Josephine Tey, her 6th Alan Grant novel, is displayed on my Kindle as "Alan Grant [06] - The Singing Sands"
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