One quick comment; I repacked the case a bit. I took one of the full sized strikers that are packaged in the 25 count boxes of the UCO matches and sealed it in plastic with my vacuum sealer. I really got the dimensions down to just 1 mm bigger than the striker. By carefully packing matches around the sealed striker and staggering them head up and head down I got 23 matches plus the extra striker.

I also sealed the included stick-on striker the same way. I slid it down against the full sized one with no loss of match capacity. Maybe I'll pull the full sized one out and see if that buys me space for a few more matches but for now I'm leaning towards maximum striking redundancy vs firepower.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman