First of all, love your well thought out and researched question. It helps us a lot when trying to provide you with good answers.

Mario's find a midi file, download and use the file drum track is the immediate answer I thought of for a song with a drum track that is as distinctive as 50 Ways To "Leave A Lover". It is likely the quickest and easiest way to get that drum part since it is so unique.

Using PG Music BiaB provided drums I would use a combination of midi drum march styles for the snare only parts of the song and other midi drum styles for the chorus parts of the song. By using midi drums throughout the song you don't have to worry about matching drum tones.

Now for your other questions.

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Question 2: I realize that BiaB is not a comprehensive drum machine but if the current version cannot provide accurate styles for these and other grooves, is this something that can be included in future versions?
New styles sometimes include new RealDrums so they are included in new releases.

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Question 3: Would a 16 or 32 step drum sequencer built-in to BiaB and be compatible with the existing styles make sense?
I think a 16 or 32 beat drum sequencer would be a great addition to Band-in-a-Box. The drum sequencer could use the program's midi synth selections since they have drum kits. What would REALLY be nice would be if the drum sequencer output could be sent to the Stylemaker. I hope you will make the wishlist request so I can support it.

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Question 4: If BiaB cannot support this would something like EZDrummer fill this gap?
Several forum members use apps like EZDrummer to create custom drum tracks.

Jim Fogle - 2026 BiaB (Build 1220) RB (Build 7) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home