Unicode block “General Punctuation” starting at U+2000 contains many “dashes” but they are wider than U+002D HYPHEN MINUS:
- U+2010 HYPHEN (probably looking exactly the same as U+002D)
- U+2012 FIGURE DASH, as wide as a digit
The others are even wider.
You could have a try with U+2043 BULLET HYPHEN (which has not the “bullet” property despite its name but I think this is irrelevant in your case) but it is usually thicker than common hyphens.
I don’t know of a character being officially narrower than a hyphen.
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