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Glad it works. How about this somewhat shorter approach:
END {if (SEQ) printf "-%0*d", LEN, $1
printf "]\n"
}

How about
awk '
NR == 1 {PFX = substr ($1, 1, match ($1, /[0-9]/)-1)
printf "%s[", PFX
LEN = length($1) - length(PFX)
PRE = -1E9
...